User blog comment:Damac1214/Mob of the Dead Achievements Leaked/@comment-24889418-20130413104716/@comment-1263839-20130413111146

Was you thinking of Turned? Because there's no achievements specifically designed for Grief mode.

But I hate Turned, it's okish as a game mode but every time you die (which is far too often) it counts as a down. And you can't get the achievement to kill with all weapons because you need to boost to get a kill with the M1911, unless you have aimbot and can get headshots with a rapid pad.