achievements.m

- (void)loadAchievements
{
    NSLog(@"loadAchievements");
    [GKAchievement loadAchievementsWithCompletionHandler:^(NSArray *achievements, NSError *error) {
        if (error != nil)
        {
        }
        if (achievements != nil)
        {
            NSLog(@"Achievements loaded for player: %@", achievements);
            NSMutableDictionary *tempCache = [NSMutableDictionary dictionaryWithCapacity:[achievements count]];
            for (GKAchievement *achievement in achievements)
            {
                [tempCache setObject:achievement forKey:achievement.identifier];
            }
            self.achievements = tempCache;

            [self callDelegateOnMainThread:@selector(didLoadAchievements:withError:) withArg:self.achievements error:error];
        }
    }];
}

- (void)loadAchievementList
{
    NSLog(@"loadAchievementList");
    if (self.achievementDescriptions)
    {
        [self callDelegateOnMainThread:@selector(didLoadAchievementList:withError:) withArg:self.achievementDescriptions error:nil];
        return;
    }
    
    [GKAchievementDescription loadAchievementDescriptionsWithCompletionHandler:^(NSArray *descriptions, NSError *error) {
        if (error != nil)
        {
            NSLog(@"error in loadAchievementDescriptionsWithCompletionHandler %@", error);
            [self callDelegateOnMainThread:@selector(didLoadAchievementList:withError:) withArg:NULL error:error];
        }
        if (descriptions != nil)
        {
            NSLog(@"Achievement descriptions loaded: %@", descriptions);
            self.achievementDescriptions = descriptions;
            [self callDelegateOnMainThread:@selector(didLoadAchievementList:withError:) withArg:self.achievementDescriptions error:error];
        }
    }];
}