Story related. Chapter 5 “Icy Incursion” – Nilfrost Rig, after you plant the two charges on the Oil Rig, you're given 4 minutes to escape the oil rig. What you need to do is get to the main deck and jump off a ramp. Follow the objective marker all the way upwards while you get rid of enemies along the way and the trophy will unlock when you reach the point where Sev jumps off the Oil Rig in his Jet Pack. We recommend you play this section on Recruit difficulty, just ignore the enemies and head straight to where the objective markers tell you to go.