Here is the full list of all 16 Roommates achievements.
Unlock Anne's Summer CG playing as Max
Unlock Max's Summer CG playing as Anne
Unlock Max's ending CG playing as Anne
Unlock Isabella's Summer CG playing as Anne
Unlock Isabella's ending CG playing as Anne
Unlock Dominic's Summer CG playing as Anne
Unlock Dominic's ending CG playing as Anne
Unlock Rakesh's Summer CG playing as Anne
Unlock Rakesh's ending CG playing as Anne
Unlock Isabella's Summer CG playing as Max
Unlock Isabella's ending CG playing as Max
Unlock Sally's Summer CG playing as Max
Unlock Sally's ending CG playing as Max
Unlock Rakesh's Summer CG playing as Max
Unlock Rakesh's ending CG playing as Max
Unlock Anne's ending CG playing as Max