According to the website Xbox Achievements, there will be 33 achievements totaling the full 1000 points for Grand Theft Auto: San Andreas on Xbox 360, which doesn't exist yet.
The Xbox Originals version of San Andreas was taken down a while ago, and Rockstar hasn't announced official yet about this, but it will be the tenth anniversary of the game's original release on October 26, 2004 very soon.
This might be a little bit like having an old game being re-released on an old console (okay, maybe that not that old, but it will be in a few years). An HD remake of the game would make sense for PS4 and Xbox One, or perhaps a Grand Theft Auto collection of some sort would be nice.
