diff --git a/contracts/src/wager/types.cairo b/contracts/src/wager/types.cairo
index 48acc75..2257adc 100644
--- a/contracts/src/wager/types.cairo
+++ b/contracts/src/wager/types.cairo
@@ -52,3 +52,83 @@ pub enum WagerState {
     Resolved,
     Cancelled
 }
+
+#[derive(Copy, Drop, Serde)]
+pub struct Achievement {
+    pub achievement_type: AchievementType,
+    pub earned_at: u64,
+    pub wager_id: u64,
+}
+
+#[derive(Copy, Drop, Serde, PartialEq)]
+pub enum AchievementType {
+    FirstWager, // Created first wager
+    FirstWin, // Won first wager
+    FirstJoin, // Joined first wager
+    WinStreak5, // 5 consecutive wins
+    WinStreak10, // 10 consecutive wins
+    AccuratePrediction, // 80%+ accuracy over 10 wagers
+    HighStaker, // Placed wager worth 1000+ STRK
+    FrequentPlayer, // Participated in 50+ wagers
+    WealthyWinner, // Won 10,000+ STRK total
+    QuickWinner, // Won within first 24 hours of wager creation
+}
+
+#[derive(Copy, Drop, Serde)]
+pub struct UserStats {
+    pub total_wagers_created: u64,
+    pub total_wagers_joined: u64,
+    pub total_wins: u64,
+    pub total_losses: u64,
+    pub current_win_streak: u64,
+    pub best_win_streak: u64,
+    pub total_volume_wagered: u256,
+    pub total_winnings: u256,
+    pub accuracy_percentage: u64, // percentage (0-100)
+}
+
+impl AchievementTypeIntoFelt252 of Into<AchievementType, felt252> {
+    fn into(self: AchievementType) -> felt252 {
+        match self {
+            AchievementType::FirstWager => 'FIRSTWAGER',
+            AchievementType::FirstWin => 'FIRSTWIN',
+            AchievementType::FirstJoin => 'FIRSTJOIN',
+            AchievementType::WinStreak5 => 'WINSTREAK5',
+            AchievementType::WinStreak10 => 'WINSTREAK10',
+            AchievementType::AccuratePrediction => 'ACCURATEPREDICTION',
+            AchievementType::HighStaker => 'HIGHSTAKER',
+            AchievementType::FrequentPlayer => 'FREQUENTPLAYER',
+            AchievementType::WealthyWinner => 'WEALTHYWINNER',
+            AchievementType::QuickWinner => 'QUICKWINNER',
+        }
+    }
+}
+
+impl Felt252TryIntoAchievementType of TryInto<felt252, AchievementType> {
+    fn try_into(self: felt252) -> Option<AchievementType> {
+        if self == 'FIRSTWAGER' {
+            Option::Some(AchievementType::FirstWager)
+        } else if self == 'FIRSTWIN' {
+            Option::Some(AchievementType::FirstWin)
+        } else if self == 'FIRSTJOIN' {
+            Option::Some(AchievementType::FirstJoin)
+        } else if self == 'WINSTREAK5' {
+            Option::Some(AchievementType::WinStreak5)
+        } else if self == 'WINSTREAK10' {
+            Option::Some(AchievementType::WinStreak10)
+        } else if self == 'ACCURATEPREDICTION' {
+            Option::Some(AchievementType::AccuratePrediction)
+        } else if self == 'HIGHSTAKER' {
+            Option::Some(AchievementType::HighStaker)
+        } else if self == 'FREQUENTPLAYER' {
+            Option::Some(AchievementType::FrequentPlayer)
+        } else if self == 'WEALTHYWINNER' {
+            Option::Some(AchievementType::WealthyWinner)
+        } else if self == 'QUICKWINNER' {
+            Option::Some(AchievementType::QuickWinner)
+        } else {
+            Option::None
+        }
+    }
+}
+
diff --git a/contracts/src/wager/wager.cairo b/contracts/src/wager/wager.cairo
index 250d6bd..e708e16 100644
--- a/contracts/src/wager/wager.cairo
+++ b/contracts/src/wager/wager.cairo
@@ -12,7 +12,9 @@ pub mod StrkWager {
     use starknet::get_block_timestamp;
 
     use contracts::wager::interface::IStrkWager;
-    use contracts::wager::types::{Wager, Category, Mode, Claim, WagerState};
+    use contracts::wager::types::{
+        Wager, Category, Mode, Claim, WagerState, AchievementType, Achievement, UserStats
+    };
     use openzeppelin::introspection::src5::SRC5Component;
     use openzeppelin::access::accesscontrol::{AccessControlComponent};
     use openzeppelin::token::erc20::interface::{IERC20Dispatcher, IERC20DispatcherTrait};
@@ -50,6 +52,10 @@ pub mod StrkWager {
         accesscontrol: AccessControlComponent::Storage,
         #[substorage(v0)]
         src5: SRC5Component::Storage,
+        // Reputation system storage
+        user_stats: Map<ContractAddress, UserStats>,
+        user_achievements: Map<ContractAddress, Map<AchievementType, Achievement>>,
+        user_achievement_count: Map<ContractAddress, u64>,
     }
 
     #[event]