100 Headshots Trophy

This trophy will be hard to miss during your Crushing playthrough, as you will want to shoot as many enemies in the head as possible to execute one-shot kills and conserve ammo. The trophy is cumulative, so if for whatever reason you were unable to reach 100 headshots during your first playthrough, you can use chapter select and go to any area of the game with enemies to farm this trophy.

You can check your headshot count at any time on the Statistics screen in the Bonuses menu. If you do wish to farm the trophy, simply restart checkpoints after killing enemies via headshot, and then headshot them again (repeat until the trophy pops).