Here is the full list of all 12 Ugly Americans: Apocalypsegeddon trophies - there are 7 bronze, 4 silver and 1 gold.
Resuscitate 50 allies.
Complete all levels without using special attacks.
Kill 5000 Demons.
Collect all the projectiles.
Complete the game in an online multiplayer session.
Complete the game using any character.
Use any special attack 100 times.
Kill 1000 Manbirds.
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.