Recently I was chatting with XBL support team and they sent me here to post about my problem because my issue can be resolved only by Enforcement team.
So about my problem:
I've played PAC-MAN CE DX on my Nokia Lumia 925 (WP8).
Unlocked all of the achievements and then when i'm checking in the in-game achievement list it says "Unlocked 29.05.2014" on all of the achievements.
When i'm checking list of recent activity on my Xbox 360 / games hub on my phone / XBL site - near PAC-MAN CE DX i can see only 180/200G 11/12 achievements.
But when i'm opening game card on any of the devices mentioned before i can see that all achievements have "UNLOCKED ON 29/05/2014" near them.
\\\ I've tried to reinstall game,redo all achievements, reset my phone and repeat. Nothing helped. When i'm starting game it's just download all save data and says that i've already unlocked all achievements \\\