Fully upgrade the overdrive

Get a multiplier of 5x

Save two humans within a span of one second

Complete Acis

Save a human

Finish the game without upgrading any skills with green gel.

Remove an invisible enemy from the equation.

I'm not taking any chances, this bus can't take much more damage. (Ch. 12)

Kill 200 enemies.

Unlock all trophies.

Successfully complete hard mode.

Find the mop.

Find the skull.