This trophy is titled "Amnesia" and it requires you to help a ghost woman named Julie who is upset and standing on the beach.
After Ronan exits the apartment and begins heading to the church, walk forward into the street and make a right toward the wall. Turn right and walk through the dumpster and fence. Walk around the ghost boat, around the back to its opposite side, to find a path down to the beach.
Walk onto the beach to find a woman crying. Speak with her and she'll let Ronan know she can't remember why she's there, but she remembers the name Monoansett.
After Ronan offers his help, turn around and reveal the Newspaper in the patch of grass. To the right of the grass are some Candles in the sand to be revealed. Walk forward to the rowboat to reveal a Bouquet of flowers. Next, walk just passed the rowboat to reveal a Memorial on the beach. Finally, walk to the picnic table by the candles to reveal a Framed Picture.
With all the clues, press the Triangle Button to find the answer to Julie's amnesia. Select Newspaper Obituary, Bouquet of Flowers, and Framed Picture to unveil what happened to her. Speak with Julie to give her peace and unlock the trophy.