Ugly Americans: Apocalypsegeddon

This is quite easily obtained in single player on case file 1. Since this is the first level, the enemies (Manbirds) are not that hard to kill. Once you reach the two Manbirds wearing wrestling masks you should have gotten the trophy if you weren't hit. A simple but effective strategy (for the rest of the game as well) is to kill the Manbirds that are pooping first; if you step in it it will slow your character down drastically and make it a lot easier for them to attack you.