Cheat List 
To use these cheats, you must first beat the game. In addition, you also must also unlock each of the cheats. Refer to the Unlock Trophies/Enable Cheats List to see how. 
Enable Cheats: CIRCLE, SQUARE, TRIANGLE, X, L1, L1, LEFT, LEFT 

Gain All Weapons: SQUARE, X, CIRCLE, X, UP, DOWN, UP, DOWN 

Improve Edges: L1, L1, CIRCLE, CIRCLE, DOWN, DOWN, UP, DOWN 

Max Ammo: RIGHT, RIGHT, RIGHT, RIGHT, UP, DOWN, UP, DOWN 

Max Health: TRIANGLE, TRIANGLE, CIRCLE, CIRCLE, SQUARE, L1, SQUARE, R1 

Mega Melee Damage: DOWN, DOWN, R1, R1, UP, X, UP, CIRCLE 

Monster Spawning On/Off: SQUARE, SQUARE, CIRCLE, CIRCLE, TRIANGLE, L1, L1 

No Conviction Cost for Edges: L2, UP, X, UP, SQUARE, DOWN, DOWN 

Tougher Monsters: SQUARE, SQUARE, TRIANGLE, SQUARE, L2, L2, UP, DOWN 

Unlimited Ammo: X, TRIANGLE, CIRCLE, SQUARE, TRIANGLE, UP, DOWN, DOWN 

Unlimited Life: RIGHT, RIGHT, RIGHT, X, UP, TRIANGLE, UP, SQUARE 


Unlock Models 
Unlock Models following the list below, then view them in the Entertainment Center. 
Emma: Save her 
Joshua: Save him 
Le Roi: Save him 
Devin: Beat him 
The Werewolf: Beat him 
The Machine: Beat him 
The Witch: Beat her 
Nephrack: Beat him 
Carpenter: Beat the game on Nightmare 
Rot Hand: Kill 25 Rot Hands 
Rot: Kill 199 Rots 
Prison Guard Rot: Kill 20 Prison Guard Rots 
Flamethrower Rot: Kill 8 Flamethrower Rots 
Gargoyle: Kill 10 Gargoyles 
Hanged Spirit: Kill 7 Hanged Spirits 
Mourner: Kill 40 Mourners 
Aileron: Kill 75 Ailerons 
Cultist: Kill 20 Cultists 
War Ghoul: Kill 2 War Ghouls 
Machine Monster: Kill 20 Machine Monsters 
Samantha: Unlock 8 models 
Father Esteban: Unlock 12 models 
Kassandra: Unlock 18 models

Unlock Trophies/Enable Cheats 
Trophy - How to Get - Effect 

Nephrack - Beat Nephrack - Enable Cheats 

Team Up - Beat the game with two players - Unlock Tougher Monsters Cheat 

Gun Bunny - Beat Downtown and kill all enemies with only your starting ranged weapon - Unlock Max Ammo Cheat 

Looter Get - all silver pieces - Unlock Gain All Weapons Cheat 

Life Saver - Save all Innocents in the Lower Level of the Prison Hospital- Unlock No Conviction Cost for Edges Cheat 

Pit Fighter - Beat Downtown and kill all enemies with only your starting melee weapon - Unlock Max Health Cheat 

Rogue Hunter - Beat the Rogue Hunter - Unlock Unlimited Ammo Cheat 

The Machine - Beat the Machine Boss - Unlock Mega Melee Damage 

Warrior - Beat all enemies in Midtown - Unlock Unlimited Life Cheat 

Werewolf - Beat the Werewolf - Unlock Monster Spawning On/Off Cheat 

Chaingun - Piece together the Chaingun 

Deserter - Leave too many Innocents in the Lower Level of the Prison Hospital

Grenade Launcher - Piece together the Grenade Launcher