Max out the bottle bar
Max out your HP bar
Max out the ammo bar
Spend 3 hours fighting
Rise from the dead
Defeat Big Wac
Defeat 100 enemies with Soulgun
Complete the game, any ending
The ending: LOU agrees to Big Wac's proposal
Defeat 100 enemies with BFG
Use rage 20 times
Defeat 100 burgers
Defeat 100 enemies with a bazooka shot
Buy 5 abilities in store
Defeat Nerdomancer
Defeat El Roico
Defeat 50 enemies with a revolver
Defeat 30 enemies with dash
Spend 100 grand
Defeat 30 tourists
Blow up 20 vending machines
Collect 100.000 coins
Defeat 30 enemies with minions
Summon 20 imps with magic
Defeat 100 enemies with AK 47
Defeat Behemoth
Defeat 500 enemies
Open 20 doors
Blow up 50 barrels
Complete "Steak from Hell" quest
Defeat 15 enemies in 3 seconds
Blow up 5 enemies with one grenade (AK 47 alt attack)
Don't use bottles during one level
Complete "Save our bones" quest
Defeat 10 enemies by blasting a barrel
Defeat 50 enemies with a shotgun