I am an achievement whore, and when there are achievements that are just ridiculous, I get pissed off. I don't mind if there are some multiplayer achievements in a game, but some are just stupid, for example the one for GRAW where you need to be ranked #1 on the servers, that is probably the stupidest multiplayer achievement ever. The multiplayer achievements that I don't mind are the ones where they want you to play in every gametype or play on every map, this encourages people to at least play the multiplayer, but not require you to play the game forever.