While creating achievements at Game Center, I made the total score equal to 1000 in hope I can later add new achievements.
However now, when the achievements are live, I can't find a way to change score for existing achievements. This means that any new achievement must have score 0, resulting in the achievement table inconsistency, as a less important old achivements will have a better score that a new one.
I agree that an existing achievement cannot be deleted or change its ID. But why changing the score is disallowed? It looks really illogical to me and, I guess, causes problems not only to me.