Hello, at first sorry for my bad english.
I was playing Black Ops II yesterday (5/11/2013) and I joined a game and one hacker was inside the lobby. He gave us some abilities, for example god mode and something like that.
But: He also started a hack, where everyone in the lobby got all achievements in the game (1000G). Is it possible to remove all achievements of mine from 5/11/13?. Also, my friend got banned, eventhough he hasn't even done anything. He has gotten a 2week ban, but I think that this in the wrong section for this.