Various cheats
99 Conviction: 
     During gameplay press Y, Y, Y, Y, Up, Down, Up, Down

Unlimited Ammo: 
     During gameplay press X, X, X, X, Up, Up, Down, Down

All Secrets: 
     During gameplay press X, B, X, B, Up, Up, Down, Down

Unlock Extra Characters:
Carpenter               Reach melee level 99 with any hunter
Vincent                 Reach ranged level 99 with any hunter
Werewolf                Reach conviction level 99 with any hunter
Joshua                  Let 250 innocents die