diff --git a/internal/achievements/database.go b/internal/achievements/database.go
new file mode 100644
index 0000000..032ff90
--- /dev/null
+++ b/internal/achievements/database.go
@@ -0,0 +1,301 @@
+package achievements
+
+import (
+	"eq2emu/internal/database"
+	"fmt"
+	"time"
+)
+
+// LoadAllAchievements loads all achievements from database into master list
+func LoadAllAchievements(db *database.DB, masterList *MasterList) error {
+	query := `SELECT achievement_id, title, uncompleted_text, completed_text,
+			  category, expansion, icon, point_value, qty_req, hide_achievement,
+			  unknown3a, unknown3b FROM achievements`
+
+	err := db.Query(query, func(row *database.Row) error {
+		achievement := NewAchievement()
+		achievement.ID = uint32(row.Int(0))
+		achievement.Title = row.Text(1)
+		achievement.UncompletedText = row.Text(2)
+		achievement.CompletedText = row.Text(3)
+		achievement.Category = row.Text(4)
+		achievement.Expansion = row.Text(5)
+		achievement.Icon = uint16(row.Int(6))
+		achievement.PointValue = uint32(row.Int(7))
+		achievement.QtyRequired = uint32(row.Int(8))
+		achievement.Hide = row.Bool(9)
+		achievement.Unknown3A = uint32(row.Int(10))
+		achievement.Unknown3B = uint32(row.Int(11))
+
+		// Load requirements and rewards
+		if err := loadAchievementRequirements(db, achievement); err != nil {
+			return fmt.Errorf("failed to load requirements for achievement %d: %w", achievement.ID, err)
+		}
+
+		if err := loadAchievementRewards(db, achievement); err != nil {
+			return fmt.Errorf("failed to load rewards for achievement %d: %w", achievement.ID, err)
+		}
+
+		if !masterList.AddAchievement(achievement) {
+			return fmt.Errorf("duplicate achievement ID: %d", achievement.ID)
+		}
+
+		return nil
+	})
+
+	return err
+}
+
+// loadAchievementRequirements loads requirements for a specific achievement
+func loadAchievementRequirements(db *database.DB, achievement *Achievement) error {
+	query := `SELECT achievement_id, name, qty_req
+			  FROM achievements_requirements
+			  WHERE achievement_id = ?`
+
+	return db.Query(query, func(row *database.Row) error {
+		req := Requirement{
+			AchievementID: uint32(row.Int(0)),
+			Name:          row.Text(1),
+			QtyRequired:   uint32(row.Int(2)),
+		}
+		achievement.AddRequirement(req)
+		return nil
+	}, achievement.ID)
+}
+
+// loadAchievementRewards loads rewards for a specific achievement
+func loadAchievementRewards(db *database.DB, achievement *Achievement) error {
+	query := `SELECT achievement_id, reward
+			  FROM achievements_rewards
+			  WHERE achievement_id = ?`
+
+	return db.Query(query, func(row *database.Row) error {
+		reward := Reward{
+			AchievementID: uint32(row.Int(0)),
+			Reward:        row.Text(1),
+		}
+		achievement.AddReward(reward)
+		return nil
+	}, achievement.ID)
+}
+
+// LoadPlayerAchievements loads player achievements from database
+func LoadPlayerAchievements(db *database.DB, playerID uint32, playerList *PlayerList) error {
+	query := `SELECT achievement_id, title, uncompleted_text, completed_text,
+			  category, expansion, icon, point_value, qty_req, hide_achievement,
+			  unknown3a, unknown3b FROM achievements`
+
+	err := db.Query(query, func(row *database.Row) error {
+		achievement := NewAchievement()
+		achievement.ID = uint32(row.Int(0))
+		achievement.Title = row.Text(1)
+		achievement.UncompletedText = row.Text(2)
+		achievement.CompletedText = row.Text(3)
+		achievement.Category = row.Text(4)
+		achievement.Expansion = row.Text(5)
+		achievement.Icon = uint16(row.Int(6))
+		achievement.PointValue = uint32(row.Int(7))
+		achievement.QtyRequired = uint32(row.Int(8))
+		achievement.Hide = row.Bool(9)
+		achievement.Unknown3A = uint32(row.Int(10))
+		achievement.Unknown3B = uint32(row.Int(11))
+
+		// Load requirements and rewards
+		if err := loadAchievementRequirements(db, achievement); err != nil {
+			return fmt.Errorf("failed to load requirements: %w", err)
+		}
+
+		if err := loadAchievementRewards(db, achievement); err != nil {
+			return fmt.Errorf("failed to load rewards: %w", err)
+		}
+
+		if !playerList.AddAchievement(achievement) {
+			return fmt.Errorf("duplicate achievement ID: %d", achievement.ID)
+		}
+
+		return nil
+	})
+
+	return err
+}
+
+// LoadPlayerAchievementUpdates loads player achievement progress from database
+func LoadPlayerAchievementUpdates(db *database.DB, playerID uint32, updateList *PlayerUpdateList) error {
+	query := `SELECT char_id, achievement_id, completed_date
+			  FROM character_achievements
+			  WHERE char_id = ?`
+
+	return db.Query(query, func(row *database.Row) error {
+		update := NewUpdate()
+		update.ID = uint32(row.Int(1))
+
+		// Convert completed_date from Unix timestamp
+		if !row.IsNull(2) {
+			timestamp := row.Int64(2)
+			update.CompletedDate = time.Unix(timestamp, 0)
+		}
+
+		// Load update items
+		if err := loadPlayerAchievementUpdateItems(db, playerID, update); err != nil {
+			return fmt.Errorf("failed to load update items: %w", err)
+		}
+
+		if !updateList.AddUpdate(update) {
+			return fmt.Errorf("duplicate achievement update ID: %d", update.ID)
+		}
+
+		return nil
+	}, playerID)
+}
+
+// loadPlayerAchievementUpdateItems loads progress items for an achievement update
+func loadPlayerAchievementUpdateItems(db *database.DB, playerID uint32, update *Update) error {
+	query := `SELECT achievement_id, items
+			  FROM character_achievements_items
+			  WHERE char_id = ? AND achievement_id = ?`
+
+	return db.Query(query, func(row *database.Row) error {
+		item := UpdateItem{
+			AchievementID: uint32(row.Int(0)),
+			ItemUpdate:    uint32(row.Int(1)),
+		}
+		update.AddUpdateItem(item)
+		return nil
+	}, playerID, update.ID)
+}
+
+// SavePlayerAchievementUpdate saves or updates player achievement progress
+func SavePlayerAchievementUpdate(db *database.DB, playerID uint32, update *Update) error {
+	return db.Transaction(func(tx *database.DB) error {
+		// Save or update main achievement record
+		query := `INSERT OR REPLACE INTO character_achievements
+				  (char_id, achievement_id, completed_date) VALUES (?, ?, ?)`
+
+		var completedDate *int64
+		if !update.CompletedDate.IsZero() {
+			timestamp := update.CompletedDate.Unix()
+			completedDate = &timestamp
+		}
+
+		if err := tx.Exec(query, playerID, update.ID, completedDate); err != nil {
+			return fmt.Errorf("failed to save achievement update: %w", err)
+		}
+
+		// Delete existing update items
+		deleteQuery := `DELETE FROM character_achievements_items
+					   WHERE char_id = ? AND achievement_id = ?`
+		if err := tx.Exec(deleteQuery, playerID, update.ID); err != nil {
+			return fmt.Errorf("failed to delete old update items: %w", err)
+		}
+
+		// Insert new update items
+		itemQuery := `INSERT INTO character_achievements_items
+					  (char_id, achievement_id, items) VALUES (?, ?, ?)`
+		for _, item := range update.UpdateItems {
+			if err := tx.Exec(itemQuery, playerID, item.AchievementID, item.ItemUpdate); err != nil {
+				return fmt.Errorf("failed to save update item: %w", err)
+			}
+		}
+
+		return nil
+	})
+}
+
+// DeletePlayerAchievementUpdate removes player achievement progress from database
+func DeletePlayerAchievementUpdate(db *database.DB, playerID uint32, achievementID uint32) error {
+	return db.Transaction(func(tx *database.DB) error {
+		// Delete main achievement record
+		query := `DELETE FROM character_achievements
+				  WHERE char_id = ? AND achievement_id = ?`
+		if err := tx.Exec(query, playerID, achievementID); err != nil {
+			return fmt.Errorf("failed to delete achievement update: %w", err)
+		}
+
+		// Delete update items
+		itemQuery := `DELETE FROM character_achievements_items
+					  WHERE char_id = ? AND achievement_id = ?`
+		if err := tx.Exec(itemQuery, playerID, achievementID); err != nil {
+			return fmt.Errorf("failed to delete update items: %w", err)
+		}
+
+		return nil
+	})
+}
+
+// SaveAchievement saves or updates an achievement in the database
+func SaveAchievement(db *database.DB, achievement *Achievement) error {
+	return db.Transaction(func(tx *database.DB) error {
+		// Save main achievement record
+		query := `INSERT OR REPLACE INTO achievements
+				  (achievement_id, title, uncompleted_text, completed_text,
+				   category, expansion, icon, point_value, qty_req,
+				   hide_achievement, unknown3a, unknown3b)
+				  VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
+
+		if err := tx.Exec(query, achievement.ID, achievement.Title,
+			achievement.UncompletedText, achievement.CompletedText,
+			achievement.Category, achievement.Expansion, achievement.Icon,
+			achievement.PointValue, achievement.QtyRequired, achievement.Hide,
+			achievement.Unknown3A, achievement.Unknown3B); err != nil {
+			return fmt.Errorf("failed to save achievement: %w", err)
+		}
+
+		// Delete existing requirements and rewards
+		if err := tx.Exec("DELETE FROM achievements_requirements WHERE achievement_id = ?", achievement.ID); err != nil {
+			return fmt.Errorf("failed to delete old requirements: %w", err)
+		}
+		if err := tx.Exec("DELETE FROM achievements_rewards WHERE achievement_id = ?", achievement.ID); err != nil {
+			return fmt.Errorf("failed to delete old rewards: %w", err)
+		}
+
+		// Insert requirements
+		reqQuery := `INSERT INTO achievements_requirements
+					 (achievement_id, name, qty_req) VALUES (?, ?, ?)`
+		for _, req := range achievement.Requirements {
+			if err := tx.Exec(reqQuery, req.AchievementID, req.Name, req.QtyRequired); err != nil {
+				return fmt.Errorf("failed to save requirement: %w", err)
+			}
+		}
+
+		// Insert rewards
+		rewardQuery := `INSERT INTO achievements_rewards
+					   (achievement_id, reward) VALUES (?, ?)`
+		for _, reward := range achievement.Rewards {
+			if err := tx.Exec(rewardQuery, reward.AchievementID, reward.Reward); err != nil {
+				return fmt.Errorf("failed to save reward: %w", err)
+			}
+		}
+
+		return nil
+	})
+}
+
+// DeleteAchievement removes an achievement and all related records from database
+func DeleteAchievement(db *database.DB, achievementID uint32) error {
+	return db.Transaction(func(tx *database.DB) error {
+		// Delete main achievement
+		if err := tx.Exec("DELETE FROM achievements WHERE achievement_id = ?", achievementID); err != nil {
+			return fmt.Errorf("failed to delete achievement: %w", err)
+		}
+
+		// Delete requirements
+		if err := tx.Exec("DELETE FROM achievements_requirements WHERE achievement_id = ?", achievementID); err != nil {
+			return fmt.Errorf("failed to delete requirements: %w", err)
+		}
+
+		// Delete rewards
+		if err := tx.Exec("DELETE FROM achievements_rewards WHERE achievement_id = ?", achievementID); err != nil {
+			return fmt.Errorf("failed to delete rewards: %w", err)
+		}
+
+		// Delete player progress (optional - might want to preserve history)
+		if err := tx.Exec("DELETE FROM character_achievements WHERE achievement_id = ?", achievementID); err != nil {
+			return fmt.Errorf("failed to delete player achievements: %w", err)
+		}
+		if err := tx.Exec("DELETE FROM character_achievements_items WHERE achievement_id = ?", achievementID); err != nil {
+			return fmt.Errorf("failed to delete player achievement items: %w", err)
+		}
+
+		return nil
+	})
+}
diff --git a/internal/achievements/doc.go b/internal/achievements/doc.go
new file mode 100644
index 0000000..65e6b36
--- /dev/null
+++ b/internal/achievements/doc.go
@@ -0,0 +1,32 @@
+// Package achievements provides a complete achievement system for EQ2Emulator servers.
+//
+// The package includes:
+//   - Achievement definitions with requirements and rewards
+//   - Master achievement list for server-wide management
+//   - Player-specific achievement tracking and progress
+//   - Database operations for persistence
+//
+// Basic usage:
+//
+//	// Create master list and load from database
+//	masterList := achievements.NewMasterList()
+//	db, _ := database.Open("world.db")
+//	achievements.LoadAllAchievements(db, masterList)
+//
+//	// Create player manager
+//	playerMgr := achievements.NewPlayerManager()
+//	achievements.LoadPlayerAchievements(db, playerID, playerMgr.Achievements)
+//	achievements.LoadPlayerAchievementUpdates(db, playerID, playerMgr.Updates)
+//
+//	// Update player progress
+//	playerMgr.Updates.UpdateProgress(achievementID, newProgress)
+//
+//	// Check completion
+//	if playerMgr.Updates.IsCompleted(achievementID) {
+//		// Handle completed achievement
+//	}
+//
+//	// Save progress
+//	update := playerMgr.Updates.GetUpdate(achievementID)
+//	achievements.SavePlayerAchievementUpdate(db, playerID, update)
+package achievements
diff --git a/internal/achievements/master.go b/internal/achievements/master.go
new file mode 100644
index 0000000..e18911b
--- /dev/null
+++ b/internal/achievements/master.go
@@ -0,0 +1,197 @@
+package achievements
+
+import (
+	"fmt"
+	"sync"
+)
+
+// MasterList manages the global list of all achievements
+type MasterList struct {
+	achievements map[uint32]*Achievement
+	mutex        sync.RWMutex
+}
+
+// NewMasterList creates a new master achievement list
+func NewMasterList() *MasterList {
+	return &MasterList{
+		achievements: make(map[uint32]*Achievement),
+	}
+}
+
+// AddAchievement adds an achievement to the master list
+// Returns false if achievement with same ID already exists
+func (m *MasterList) AddAchievement(achievement *Achievement) bool {
+	if achievement == nil {
+		return false
+	}
+
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	if _, exists := m.achievements[achievement.ID]; exists {
+		return false
+	}
+
+	m.achievements[achievement.ID] = achievement
+	return true
+}
+
+// GetAchievement retrieves an achievement by ID
+// Returns nil if not found
+func (m *MasterList) GetAchievement(id uint32) *Achievement {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	return m.achievements[id]
+}
+
+// GetAchievementClone retrieves a cloned copy of an achievement by ID
+// Returns nil if not found. Safe for modification without affecting master list
+func (m *MasterList) GetAchievementClone(id uint32) *Achievement {
+	m.mutex.RLock()
+	achievement := m.achievements[id]
+	m.mutex.RUnlock()
+
+	if achievement == nil {
+		return nil
+	}
+
+	return achievement.Clone()
+}
+
+// GetAllAchievements returns a map of all achievements (read-only access)
+// The returned map should not be modified
+func (m *MasterList) GetAllAchievements() map[uint32]*Achievement {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	// Return copy of map to prevent external modification
+	result := make(map[uint32]*Achievement, len(m.achievements))
+	for id, achievement := range m.achievements {
+		result[id] = achievement
+	}
+	return result
+}
+
+// GetAchievementsByCategory returns achievements filtered by category
+func (m *MasterList) GetAchievementsByCategory(category string) []*Achievement {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	var result []*Achievement
+	for _, achievement := range m.achievements {
+		if achievement.Category == category {
+			result = append(result, achievement)
+		}
+	}
+	return result
+}
+
+// GetAchievementsByExpansion returns achievements filtered by expansion
+func (m *MasterList) GetAchievementsByExpansion(expansion string) []*Achievement {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	var result []*Achievement
+	for _, achievement := range m.achievements {
+		if achievement.Expansion == expansion {
+			result = append(result, achievement)
+		}
+	}
+	return result
+}
+
+// RemoveAchievement removes an achievement from the master list
+// Returns true if achievement was found and removed
+func (m *MasterList) RemoveAchievement(id uint32) bool {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	if _, exists := m.achievements[id]; !exists {
+		return false
+	}
+
+	delete(m.achievements, id)
+	return true
+}
+
+// UpdateAchievement updates an existing achievement
+// Returns error if achievement doesn't exist
+func (m *MasterList) UpdateAchievement(achievement *Achievement) error {
+	if achievement == nil {
+		return fmt.Errorf("achievement cannot be nil")
+	}
+
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	if _, exists := m.achievements[achievement.ID]; !exists {
+		return fmt.Errorf("achievement with ID %d does not exist", achievement.ID)
+	}
+
+	m.achievements[achievement.ID] = achievement
+	return nil
+}
+
+// Clear removes all achievements from the master list
+func (m *MasterList) Clear() {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	m.achievements = make(map[uint32]*Achievement)
+}
+
+// Size returns the number of achievements in the master list
+func (m *MasterList) Size() int {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	return len(m.achievements)
+}
+
+// Exists checks if an achievement with given ID exists
+func (m *MasterList) Exists(id uint32) bool {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	_, exists := m.achievements[id]
+	return exists
+}
+
+// GetCategories returns all unique categories
+func (m *MasterList) GetCategories() []string {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	categories := make(map[string]bool)
+	for _, achievement := range m.achievements {
+		if achievement.Category != "" {
+			categories[achievement.Category] = true
+		}
+	}
+
+	result := make([]string, 0, len(categories))
+	for category := range categories {
+		result = append(result, category)
+	}
+	return result
+}
+
+// GetExpansions returns all unique expansions
+func (m *MasterList) GetExpansions() []string {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	expansions := make(map[string]bool)
+	for _, achievement := range m.achievements {
+		if achievement.Expansion != "" {
+			expansions[achievement.Expansion] = true
+		}
+	}
+
+	result := make([]string, 0, len(expansions))
+	for expansion := range expansions {
+		result = append(result, expansion)
+	}
+	return result
+}
diff --git a/internal/achievements/player.go b/internal/achievements/player.go
new file mode 100644
index 0000000..d5637c5
--- /dev/null
+++ b/internal/achievements/player.go
@@ -0,0 +1,282 @@
+package achievements
+
+import (
+	"fmt"
+	"time"
+)
+
+// PlayerList manages achievements for a specific player
+type PlayerList struct {
+	achievements map[uint32]*Achievement
+}
+
+// PlayerUpdateList manages achievement updates/progress for a specific player
+type PlayerUpdateList struct {
+	updates map[uint32]*Update
+}
+
+// NewPlayerList creates a new player achievement list
+func NewPlayerList() *PlayerList {
+	return &PlayerList{
+		achievements: make(map[uint32]*Achievement),
+	}
+}
+
+// NewPlayerUpdateList creates a new player achievement update list
+func NewPlayerUpdateList() *PlayerUpdateList {
+	return &PlayerUpdateList{
+		updates: make(map[uint32]*Update),
+	}
+}
+
+// AddAchievement adds an achievement to the player's list
+// Returns false if achievement with same ID already exists
+func (p *PlayerList) AddAchievement(achievement *Achievement) bool {
+	if achievement == nil {
+		return false
+	}
+
+	if _, exists := p.achievements[achievement.ID]; exists {
+		return false
+	}
+
+	p.achievements[achievement.ID] = achievement
+	return true
+}
+
+// GetAchievement retrieves an achievement by ID
+// Returns nil if not found
+func (p *PlayerList) GetAchievement(id uint32) *Achievement {
+	return p.achievements[id]
+}
+
+// GetAllAchievements returns all player achievements
+func (p *PlayerList) GetAllAchievements() map[uint32]*Achievement {
+	result := make(map[uint32]*Achievement, len(p.achievements))
+	for id, achievement := range p.achievements {
+		result[id] = achievement
+	}
+	return result
+}
+
+// RemoveAchievement removes an achievement from the player's list
+// Returns true if achievement was found and removed
+func (p *PlayerList) RemoveAchievement(id uint32) bool {
+	if _, exists := p.achievements[id]; !exists {
+		return false
+	}
+
+	delete(p.achievements, id)
+	return true
+}
+
+// HasAchievement checks if player has a specific achievement
+func (p *PlayerList) HasAchievement(id uint32) bool {
+	_, exists := p.achievements[id]
+	return exists
+}
+
+// Clear removes all achievements from the player's list
+func (p *PlayerList) Clear() {
+	p.achievements = make(map[uint32]*Achievement)
+}
+
+// Size returns the number of achievements in the player's list
+func (p *PlayerList) Size() int {
+	return len(p.achievements)
+}
+
+// GetAchievementsByCategory returns player achievements filtered by category
+func (p *PlayerList) GetAchievementsByCategory(category string) []*Achievement {
+	var result []*Achievement
+	for _, achievement := range p.achievements {
+		if achievement.Category == category {
+			result = append(result, achievement)
+		}
+	}
+	return result
+}
+
+// AddUpdate adds an achievement update to the player's list
+// Returns false if update with same ID already exists
+func (p *PlayerUpdateList) AddUpdate(update *Update) bool {
+	if update == nil {
+		return false
+	}
+
+	if _, exists := p.updates[update.ID]; exists {
+		return false
+	}
+
+	p.updates[update.ID] = update
+	return true
+}
+
+// GetUpdate retrieves an achievement update by ID
+// Returns nil if not found
+func (p *PlayerUpdateList) GetUpdate(id uint32) *Update {
+	return p.updates[id]
+}
+
+// GetAllUpdates returns all player achievement updates
+func (p *PlayerUpdateList) GetAllUpdates() map[uint32]*Update {
+	result := make(map[uint32]*Update, len(p.updates))
+	for id, update := range p.updates {
+		result[id] = update
+	}
+	return result
+}
+
+// UpdateProgress updates or creates achievement progress
+func (p *PlayerUpdateList) UpdateProgress(achievementID uint32, itemUpdate uint32) {
+	update := p.updates[achievementID]
+	if update == nil {
+		update = NewUpdate()
+		update.ID = achievementID
+		p.updates[achievementID] = update
+	}
+
+	// Add or update the progress item
+	found := false
+	for i := range update.UpdateItems {
+		if update.UpdateItems[i].AchievementID == achievementID {
+			update.UpdateItems[i].ItemUpdate = itemUpdate
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		update.AddUpdateItem(UpdateItem{
+			AchievementID: achievementID,
+			ItemUpdate:    itemUpdate,
+		})
+	}
+}
+
+// CompleteAchievement marks an achievement as completed
+func (p *PlayerUpdateList) CompleteAchievement(achievementID uint32) {
+	update := p.updates[achievementID]
+	if update == nil {
+		update = NewUpdate()
+		update.ID = achievementID
+		p.updates[achievementID] = update
+	}
+	update.CompletedDate = time.Now()
+}
+
+// IsCompleted checks if an achievement is completed
+func (p *PlayerUpdateList) IsCompleted(achievementID uint32) bool {
+	update := p.updates[achievementID]
+	return update != nil && !update.CompletedDate.IsZero()
+}
+
+// GetCompletedDate returns the completion date for an achievement
+// Returns zero time if not completed
+func (p *PlayerUpdateList) GetCompletedDate(achievementID uint32) time.Time {
+	update := p.updates[achievementID]
+	if update == nil {
+		return time.Time{}
+	}
+	return update.CompletedDate
+}
+
+// GetProgress returns the current progress for an achievement
+// Returns 0 if no progress found
+func (p *PlayerUpdateList) GetProgress(achievementID uint32) uint32 {
+	update := p.updates[achievementID]
+	if update == nil || len(update.UpdateItems) == 0 {
+		return 0
+	}
+
+	// Return the first matching update item's progress
+	for _, item := range update.UpdateItems {
+		if item.AchievementID == achievementID {
+			return item.ItemUpdate
+		}
+	}
+	return 0
+}
+
+// RemoveUpdate removes an achievement update from the player's list
+// Returns true if update was found and removed
+func (p *PlayerUpdateList) RemoveUpdate(id uint32) bool {
+	if _, exists := p.updates[id]; !exists {
+		return false
+	}
+
+	delete(p.updates, id)
+	return true
+}
+
+// Clear removes all updates from the player's list
+func (p *PlayerUpdateList) Clear() {
+	p.updates = make(map[uint32]*Update)
+}
+
+// Size returns the number of updates in the player's list
+func (p *PlayerUpdateList) Size() int {
+	return len(p.updates)
+}
+
+// GetCompletedAchievements returns all completed achievement IDs
+func (p *PlayerUpdateList) GetCompletedAchievements() []uint32 {
+	var completed []uint32
+	for id, update := range p.updates {
+		if !update.CompletedDate.IsZero() {
+			completed = append(completed, id)
+		}
+	}
+	return completed
+}
+
+// GetInProgressAchievements returns all in-progress achievement IDs
+func (p *PlayerUpdateList) GetInProgressAchievements() []uint32 {
+	var inProgress []uint32
+	for id, update := range p.updates {
+		if update.CompletedDate.IsZero() && len(update.UpdateItems) > 0 {
+			inProgress = append(inProgress, id)
+		}
+	}
+	return inProgress
+}
+
+// PlayerManager combines achievement list and update list for a player
+type PlayerManager struct {
+	Achievements *PlayerList
+	Updates      *PlayerUpdateList
+}
+
+// NewPlayerManager creates a new player manager
+func NewPlayerManager() *PlayerManager {
+	return &PlayerManager{
+		Achievements: NewPlayerList(),
+		Updates:      NewPlayerUpdateList(),
+	}
+}
+
+// CheckRequirements validates if player meets achievement requirements
+// This is a basic implementation - extend as needed for specific game logic
+func (pm *PlayerManager) CheckRequirements(achievement *Achievement) (bool, error) {
+	if achievement == nil {
+		return false, fmt.Errorf("achievement cannot be nil")
+	}
+
+	// Basic implementation - check if we have progress >= required quantity
+	progress := pm.Updates.GetProgress(achievement.ID)
+	return progress >= achievement.QtyRequired, nil
+}
+
+// GetCompletionStatus returns completion percentage for an achievement
+func (pm *PlayerManager) GetCompletionStatus(achievement *Achievement) float64 {
+	if achievement == nil || achievement.QtyRequired == 0 {
+		return 0.0
+	}
+
+	progress := pm.Updates.GetProgress(achievement.ID)
+	if progress >= achievement.QtyRequired {
+		return 100.0
+	}
+
+	return (float64(progress) / float64(achievement.QtyRequired)) * 100.0
+}
diff --git a/internal/achievements/types.go b/internal/achievements/types.go
new file mode 100644
index 0000000..bda4d16
--- /dev/null
+++ b/internal/achievements/types.go
@@ -0,0 +1,113 @@
+package achievements
+
+import "time"
+
+// Requirement represents a single achievement requirement
+type Requirement struct {
+	AchievementID uint32 `json:"achievement_id"`
+	Name          string `json:"name"`
+	QtyRequired   uint32 `json:"qty_required"`
+}
+
+// Reward represents a single achievement reward
+type Reward struct {
+	AchievementID uint32 `json:"achievement_id"`
+	Reward        string `json:"reward"`
+}
+
+// Achievement represents a complete achievement definition
+type Achievement struct {
+	ID              uint32        `json:"id"`
+	Title           string        `json:"title"`
+	UncompletedText string        `json:"uncompleted_text"`
+	CompletedText   string        `json:"completed_text"`
+	Category        string        `json:"category"`
+	Expansion       string        `json:"expansion"`
+	Icon            uint16        `json:"icon"`
+	PointValue      uint32        `json:"point_value"`
+	QtyRequired     uint32        `json:"qty_required"`
+	Hide            bool          `json:"hide"`
+	Unknown3A       uint32        `json:"unknown3a"`
+	Unknown3B       uint32        `json:"unknown3b"`
+	Requirements    []Requirement `json:"requirements"`
+	Rewards         []Reward      `json:"rewards"`
+}
+
+// UpdateItem represents a single achievement progress update
+type UpdateItem struct {
+	AchievementID uint32 `json:"achievement_id"`
+	ItemUpdate    uint32 `json:"item_update"`
+}
+
+// Update represents achievement completion/progress data
+type Update struct {
+	ID            uint32       `json:"id"`
+	CompletedDate time.Time    `json:"completed_date"`
+	UpdateItems   []UpdateItem `json:"update_items"`
+}
+
+// NewAchievement creates a new achievement with empty slices
+func NewAchievement() *Achievement {
+	return &Achievement{
+		Requirements: make([]Requirement, 0),
+		Rewards:      make([]Reward, 0),
+	}
+}
+
+// NewUpdate creates a new achievement update with empty slices
+func NewUpdate() *Update {
+	return &Update{
+		UpdateItems: make([]UpdateItem, 0),
+	}
+}
+
+// AddRequirement adds a requirement to the achievement
+func (a *Achievement) AddRequirement(req Requirement) {
+	a.Requirements = append(a.Requirements, req)
+}
+
+// AddReward adds a reward to the achievement
+func (a *Achievement) AddReward(reward Reward) {
+	a.Rewards = append(a.Rewards, reward)
+}
+
+// AddUpdateItem adds an update item to the achievement update
+func (u *Update) AddUpdateItem(item UpdateItem) {
+	u.UpdateItems = append(u.UpdateItems, item)
+}
+
+// Clone creates a deep copy of the achievement
+func (a *Achievement) Clone() *Achievement {
+	clone := &Achievement{
+		ID:              a.ID,
+		Title:           a.Title,
+		UncompletedText: a.UncompletedText,
+		CompletedText:   a.CompletedText,
+		Category:        a.Category,
+		Expansion:       a.Expansion,
+		Icon:            a.Icon,
+		PointValue:      a.PointValue,
+		QtyRequired:     a.QtyRequired,
+		Hide:            a.Hide,
+		Unknown3A:       a.Unknown3A,
+		Unknown3B:       a.Unknown3B,
+		Requirements:    make([]Requirement, len(a.Requirements)),
+		Rewards:         make([]Reward, len(a.Rewards)),
+	}
+
+	copy(clone.Requirements, a.Requirements)
+	copy(clone.Rewards, a.Rewards)
+	return clone
+}
+
+// Clone creates a deep copy of the achievement update
+func (u *Update) Clone() *Update {
+	clone := &Update{
+		ID:            u.ID,
+		CompletedDate: u.CompletedDate,
+		UpdateItems:   make([]UpdateItem, len(u.UpdateItems)),
+	}
+
+	copy(clone.UpdateItems, u.UpdateItems)
+	return clone
+}