I'll trade you 2 achievements for l4d2 for help on portal 2

Need professor portal achievement, all friends on my list didn't bloody tell me they've played dam game, some never bothered to buy it. that's fine and dandy,

Well any one who has either left4dead or portal 2

But for any who want any achievement on l4d2, i'll make a trade proffessor portal for

for 2 achievements listed:

1Stil have something to prove

2 And what ever else achievement listed with in your mind

3 Or Portal 2 in general

Pm me when not busy or before this thread becomes stale and moldy :)

Some people might get negative about your post... but I think you just 'discovered' something cool. Trading achievements by completing them for each other or helping each other get them.

Pretty awesome. Can't help you though. Don't own Portal 2 (yet).

I would love to help you out but I already beat most of Portal 2 co-op. So sad because I would not mind some L4D2 achievements