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.