Here is the full list of all 11 Suite 776 achievements.
Master Suite 776 by discovering most of the game's secrets and activating Ending 3!
Locate all 6 of Marcy's fond memories
Open the secret vault in the basement
Open the secret red box
Snap 15 photos of Marcy while she is moving.
Locate all 3 Gold Bars
Snap 10 photos of Marcy while she is moving
Complete Suite 776 by taking the Ending 2 path!
Complete Suite 776 in 2 minutes or less
Complete Suite 776 by taking the Ending 1 path!
Snap 5 photos of Marcy while she is moving