Warhawk

This trophy can be obtained in split-screen with two controllers.

Choose the Island Outpost map and pick TDM so you can have access to the whole map. Have one player go to Base 6 with a sniper rifle and set up facing Base 3. With the scope you can see Base 3 clearly. Player two needs to take a Warhawk from Base 3 and land it on the mountain directly behind Base 3 (it has a chaff pick-up above it) and then get out of the Warhawk and stand on the highest peak of that mountain. Once you’re both set up have the player with the sniper rifle shoot the player on top of the mountain. He’ll appear as a very very small figure. The trophy pops right after shooting him.