This trophy is titled "Collector 1" and it requires you to collect your very first artifact in the game.
Once you're in the apartment building, after concluding your first investigation, walk straight ahead and toward the left wall. Pass through the door directly ahead that says Pool Room on the placard. You should see a shaking object directly ahead of you. Approach it and press R2, as prompted on-screen, to reveal the object, an old boiler. Press the Square Button to collect the boiler and unlock the trophy.