[GKAchievementDescription loadAchievementDescriptionsWithCompletionHandler:
 ^(NSArray *descriptions, NSError *error) {
     CCLOG(@"achivements loaded");
     if (error != nil) {
         NSLog(@"Error %@", error);

 } else {
     if (descriptions != nil){
         CCLOG(@"nb %i",descriptions.count);
         for (GKAchievementDescription* a in descriptions) {
             CCLOG(@"image %@ %@ %@", a.title, a.achievedDescription, a.image);
             [achievementsDescDictionary setObject: a forKey: a.identifier];
         }
     } else {
         CCLOG(@"descriptions empty");
     }
     }
 }];