Tales from the Borderlands

Story related, cannot be missed.

Most of Chapter 4 will follow Fiona's story which continues from the point in which Rhys and Vaughn fall out the back of the vehicle. You will go to Scooters-Catch-A-Ride and meet Scooter where you will get your vehicle repaired. Once you leave you will head to Felix's safehouse. Open the safe which is behind the wall panel and pick up the blacklight, then look at the green sofa to find the ultraviolet paint and open the loose floor panel on the ground. Two thugs will soon enter the room, named Kroger and Finch. Once you escape the safe house after attacking them the trophy will unlock.