only do achievement map check on debug

Android/AndroidPlatform.cs

@@ -89,10 +89,12 @@ namespace Android {
                 .Build();
             this.GoogleApi.Connect();
 
+            #if DEBUG
             // Sanity check to ensure that all achievements are mapped
             foreach (var achievement in Achievement.Achievements.Values) {
                 var _ = AchievementIds[achievement.Name];
             }
+            #endif
         }
 
         public override void AddResourceEvent(bool sink, string currency, float amount, string itemType, string itemId) {