Life cycle of repeatable Game Center achievements?

Question

I am trying to understand the life cycle of repeatable Game Center achievements (those that have replayable set in GKAchievableDescription) based on what (little) information there is in Apple's Game Center Programming Guide.

Consider e.g. a repeatable achievement "FullCircle". My assumption is that a valid sequence could consist of the following steps:

1. app calls loadAchievementsWithCompletionHandler:, receives GKAchievement with [achievement.identifier isEqual:@"FullCircle] && (achievement.percentComplete == 0)
2. user finishes half circle for the first time
3. app sets achievement.percentComplete = 50 and calls reportAchievements:withCompletionHandler:
4. iOS Game Center app shows achievement as incomplete (sic!)
5. user finished full circle for the first time
6. app sets achievement.percentComplete = 100 and calls reportAchievements:withCompletionHandler:
7. iOS displays notification banner
8. iOS Game Center app shows achievement as complete
9. user finishes half circle for the second time
10. app sets achievement.percentComplete = 50 (sic!, not: 150) and calls reportAchievements:withCompletionHandler:
11. iOS Game Center app shows achievement as complete (sic!, because this is the second time)
12. user finished full circle for the second time
13. app sets achievement.percentComplete = 100 (sic!, not: 200) and calls reportAchievements:withCompletionHandler:
14. iOS displays notification banner
15. iOS Game Center app shows achievement as complete
16. loadAchievementsWithCompletionHandler: still reports only one (sic!, not: two) achievements for "FullCircle"

Does this make sense or am I making any wrong assumptions in this sequence? And is there any way for inquiring from Game Center how often an achievement such as "FullCircle" was earned?