Destroy the helicopter without defeating any other enemies.
This can only be done in chapter 8 with the infamous helicopter fight encounter. The area is patrolled by a lot of men, including reinforcements if you’re spotted. But the idea behind this trophy is to leave them all alone, and just hone in on the helicopter.
We recommend completing the game first so that you can unlock the RPG in weapon select, as well as enabling infinite ammo. Then enable auto-aim and fire at the helicopter a few times before grappling to it.
Once you’ve finished the encounter, you’ll receive the trophy.