@class GKAchievement; @interface GKAchievementChallenge : GKChallenge @property (retain, nonatomic) GKAchievement *achievement; @property (retain, nonatomic) GKAchievement *achievement; + (BOOL)instancesRespondToSelector:(SEL)a0; - (void)setInternal:(id)a0; - (id)titleText; - (id)description; - (void).cxx_destruct; - (id)initWithInternalRepresentation:(id)a0; - (BOOL)detailsLoaded; - (void)loadDetailsWithCompletionHandler:(id /* block */)a0; - (id)detailGoalTextForPlayer:(id)a0 withAchievement:(id)a1; @end