Knock up an enemy as high as possible.

Blow off 666 heads!

Kill 5 enemies at the same time.

Enter the secret room in Chapter 4.

Nail down the opponent's head with the Pitter.

Kill all the Scientists at any chapter.

Finish the whole campaign without taking any damage.

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

Kill 666 enemies.

Complete the game with a total score of over 62,000.

Don't destroy any glass panels in Chapter 2.

Kill 5 enemies in a row.

Finish the campaign at any difficulty.