Robin Hoods Playground

OK i was wondering if any of the left 4 dead achievements have to be obtained online? I looked at them all and I thnik all can be played offline with a party of 4 if need be...Please help me clarify

i.e. the achievements that have a green background.

I'm pretty sure most of them can be achieved offline. I do know one thing for sure and that is that game spits achievements at you!!!

Yep, all can be done offline. I got quite a few with my brother while we were playing offline.

great thanks guys

wait! you can't play versus offline, there are 6 or so achievements earned while playing as the special infected.