Here is the full list of all 12 Fez achievements worth 200 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox 360.
Unlocking achieved.
Negative space.
Cube GET!
Find ALL collectibles.
Get to the end.
Collect all 32 Golden Cubes and 32 Anti-Cubes.
Find the Tome artifact.
Find the Skull artifact.
Find the Writing Cube artifact.
Find the Counting Cube artifact.
Reactivate all 5 warp gates.
Break the code.