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