Achievements....after the servers go down?

I'm sure this is a noobish question but I'll ask it anyway. I have a few games on my back log (Alan Wake, SC: Conviction, Reach, etc) that I have completed but I want to get the rest of the achievements. My question is for games that have multiplayer/co-op/online achievements does it simply become impossible to get them once the servers go offline? I'm sure that even a game like Conviction will still have servers up for another couple years right? I just think it is silly if achievements are unobtainable at some point, gamers are basically stuck at that point.

I was under the impression that every single game on Xbox Live has a peer to peer component meaning that there isn't a need for servers to play online. I know some games offer dedicated servers but I would be suprised to find more than a handful of games that can no longer be played online on the 360. Either way I wouldn't worry about it with the games you listed.

Hmmmmm ok. Well I'm pretty new to Xbox, so how long are the servers generally up for a game? For example I recently got RDR and I still have a ton of co-op achievements to get for SC: Conviction. Neither of those servers are likely to do down soon are they?Jurassic85

I was under the impression that every single game on Xbox Live has a peer to peer component meaning that there isn't a need for servers to play online. I know some games offer dedicated servers but I would be suprised to find more than a handful of games that can no longer be played online on the 360. Either way I wouldn't worry about it with the games you listed.

Sparky04