Wait, the U.S. version or the U.K. version?SimuLord said:Achievements are like Whose Line is it Anyway?, where everything's made up and the points don't matter.
Anyway, just to repeat what most people are saying...
Achievements don't really hurt, you can ignore them and play the game normally but to others they can provide more replay value or guide people to new/different ways to play.
The only real downside is that you do get some people comparing their achievements to others, but if they mention it at all then you know not to bother playing with that person again.
I don't really go out of my way to grind achievements, but I have started trying to oneshot witches in L4D instead of just avoiding them.