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.
Complete all levels without using special attacks.
Locate and collect all of the Demon Babies.
Kill 5000 Demons.
Complete the game in an online multiplayer session.
Complete the game using any character.
Rack up a 20 score multiplier.
Use any special attack 100 times.
Kill 1000 Manbirds.
Kill 300 Zombies.
Resuscitate 50 allies.
Defeat 50 enemies in a row without getting hit.