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.
Kill the fourth boss.
Beat the game from stage 1 without death.
Find the secret room.
Beat the game.
Kill the fifth boss.
Kill 2000 enemies.
Kill the third boss.
Kill 1000 enemies.
Tried every weapon in the game.
Walk backwards while looking forward for 10 seconds.
Find all the skull souls.
Beat the game from stage 1 (Hard Mode).