User blog comment:Damac1214/Mob of the Dead Achievements Leaked/@comment-4921618-20130412180323/@comment-2.221.47.19-20130412222342

"The last time the achievments were leaked for Die Rise on PS3 was after the DLC was already released on Xbox."

No shit. If the DLC was out on Xbox then of course the achievments would be available for PS3 too- they wouldn't add achievments to PS3 that Xbox couldn't get, that would break their contract. Speaking of contract, that is the only reason that Xbox gets it first- the map is likely ready for PS3 on Xbox launch date but their contract prevents them from doing so.