We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
GTA San Andreas, when it was released, was not released for the xbox 360 but the generation before. Like Owenkiller said, it does not have achievements and like IKing said, you will be signed out of xbox live.
You will not have access to the xbox guide or anything like that either, when you try to open it, it just says that it isn't available. For future reference, all these things are the same with any game that was originally on the original xbox and then compatible
on the 360.