This one is missable.
At one point in the game you will end up in a room in which the door shuts behind you. Most of the room will be dark and you will have to swipe your finger around the black area to find a light source. Before you find the light source you should look for 3 specific bits. These are:
Bottomless pit: Just need to view this
Figment of the Imagination: Use the Mason's Hammer on this
Imaginary Malicious Denizen: Use the Mason's Hammer on this
Once you have done this the trophy should unlock.