Finish the campaign at any difficulty.

Beat Chariot at the end of the first chapter.

Beat Hermit at the end of the third chapter.

Finish the game with a final score below 62,000 and the last score digit not equal to zero.

Finish the game with a final score below 62,000 and the last score digit equal to zero.

Save a Scientist.

Kill a Scientist.

Discover all paths available in the game.

Collect all items in a single campaign.

Collect all additional weapons available in the game.

Blow off 666 heads!

Kill 3 enemies in a row.

Kill 666 enemies.

Nail down the opponent's head with the Pitter.

Finish a single chapter without taking any damage.

Finish the full campaign with your friend!

Let Player 2 join the game while in a middle of a campaign.

Knock back the Kenfis

Finish a chapter without reloading with bullets in the chamber.

Kill all the rats in the game.