Kill the second boss.
Destroy 100 flesh tunnels with your flamethrower
Kill 500 enemies.
Kill the first boss.
Destroy every Siegfried clone in Stage 0.
Earn all trophies.
Find all the skull souls.
Walk backwards while looking forward for 10 seconds.
Tried every weapon in the game.
Kill 1000 enemies.
Kill 2000 enemies.
Kill the third boss.
Kill the fourth boss.
Kill the fifth boss.
Beat the game.
Find the secret room.
Beat the game from stage 1 without death.
Beat the game from stage 1 (Hard Mode).