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