Secure victory in the Battle of Lingshan

This trophy is story-related and cannot be missed.
You'll get at the end of Chapter 10 after defeating the Alien mothership. What you want to do first is take out the turrets (2 on each side) from cover with a Gauss Rifle (4 shots to each turret destroys them) and then wait for your team in the VTOL to get in close to disable the right side of the ship (in the meantime you fight giant Alien squids which come from the ship). When the right side is disabled (Your team will notify you) switch to the TAC Cannon, lock on (without getting killed) and fire to destroy that side. Same procedure for the left side and the center when it opens up. Be aware of the ships one-shot kill giant blue beam. Always move from cover to cover around the flight deck.