How to load and sync achievements from Game Center correctly?

Question

I'm working with Game Center now. I've created achivements on ITC and i'm logged into Game Center. Game notice me about it. Its ok. But i have to load all achivements from Game Center and check its progress. I read Apple Reference and here is class method loadAchivementsWithCompletionHandler:.

I've got something like this, but when i call it then i haven't any results - No NSLog in console.

[GKAchievement loadAchievementsWithCompletionHandler:^(NSArray *achievements, NSError *error) {

    if (error){
        NSLog(@"Error in syncing achievements: %@", error);
    }
    else {
        NSLog(@"Number of achievements: %d", [achievements count]);
    }
}];

How can i get achievements from Game Center correctly? I thought that achivements array should be greater than 0, but i don't know - Any NSLog isn't called.

UPDATE!!!

- (void)authenticateLocalUser:(void(^)(UIViewController *))delegate {

if (!_gameCenterAvailable) return;
NSLog(@"Authenticating local user...");
if (![GKLocalPlayer localPlayer].authenticated) {

    [[GKLocalPlayer localPlayer] setAuthenticateHandler:^(UIViewController *viewController, NSError *error) {

        if (viewController) {

            delegate((UIViewController *)viewController);
        }
        else {
            [NSThread sleepForTimeInterval:2];
            [sharedHelper syncAchivements:^(NSString *delegate) {

            }];
        }

        if (error) {
            NSLog(@"Error in AuthenticateLocalUser: %@", [error description]);
        }
    }];
} else {
    NSLog(@"Already authenticated!");
}

}

I call my above syncAchievement: method after authentication and i've got response: Number of achievements: 0 but my app has 2 achivements created. Where is the problem?

UPDATE 2!!!

I see that method loadAchievementWithCompletionHandler loads only achivements with some progress. I understood this..

Answer 1

I see that method loadAchievementWithCompletionHandler: loads only achievements with some progress. I understood this.. And this is an answer. All is correctly.