Splinter Cell: Conviction
This game has two glitched Achivements, mabye even more. Sometimes they unlock and sometimes not. I still do not have "Co-Op Realistic Difficulty". The whole game is full of bugs and plyers have to be warned.
Juhu, I have all achievements for Forza Motorsport 2
, Unreal Tournament 3
, Halo 3
and Splinter Cell Conviction