Haven't altered anything, and most people are having problems with the achievements.

Did you just play the game normally?

Can you try to replay the first mission and see if you get the achievement "Law-abiding citizen"? You get it for walking until you're out of the main gate at the start of the game (hold shift while moving). It should unlock a runner kit when you've done it right.

My achivements work? have u altered the files?

I heard somewhere that there are some modders working on a fix. I guess they're our only hope because there's no chance that EA will do anything to fix the problem.

They could have atleast updated the game to let it run on community servers. I only recently bought this game. It's a shame I can never play its online features.