Achievements are such a complete waste, ESPECIALLY multiplayer achievements. It's so easy just to get a friend to let you kill him 30 times in a row for achievement points, or get 3 guys to stand still while you get a triple kill cause you "want the achievement".

What's the point of them? I can think of no reason other than TRYING to make a system that in some tiny way represents skill, but... it just doesn't work like that at all.
And on the topic of achievements... you get the same achievement for beating a lvl on normal as you do for beating it on legendary. Idk... it just pissed me off. I don't really care about the points, its just that it seems so OBVIOUS to me that you should have a few separate achievements for legendary, like completing the levels.