Here is the full list of all 12 Ugly Americans: Apocalypsegeddon trophies - there are 7 bronze, 4 silver and 1 gold.
Collect all the projectiles.
Resuscitate 50 allies.
Complete the game in an online multiplayer session.
Kill 5000 Demons.
Use any special attack 100 times.
Complete all levels without using special attacks.
Kill 1000 Manbirds.
Complete the game using any character.
Locate and collect all of the Demon Babies.
Kill 300 Zombies.
Rack up a 20 score multiplier.
Defeat 50 enemies in a row without getting hit.