Usage of AchievementManager::incrementAchievementIdentifier

gistfile1.m

// Right after successful authentication
[[AchievementManager sharedManager] loadAchievements];

// When achieving a one-shot achievement, such as "Get 3 stars at first try", set progress to 100%
[[AchievementManager sharedManager] reportAchievementIdentifier:@"achievement.3starsAtFirstTry" percentComplete:100];

// When finishing a level, increment progress of "100 levels done" achievement by 1%
[[AchievementManager sharedManager] incrementAchievementIdentifier:@"achievement.100levels" percentIncrement:1];