Here is the full list of all 8 A Room Where Art Conceals trophies - there are 3 bronze, 3 silver and 2 gold.
Finish Monet Room.
Finish van Gogh Room.
Finish Munch Room.
Finish all 3 rooms.
Change the all 3 styles of collection room.
Move around in any room.
Finish all paintings video.
Watch a painting with narration.