Complete one challenge.

Kill 35 enemies with the pistol.

Find 25% of all documents.

Complete the game (any difficulty)

Kill 100 enemies with a headshot

Kill an enemy with every weapon

Kill 40 enemies with science weapons

Detonate 10 powder kegs

Defeat Great One: Mergo's Wet Nurse.

Defeat Great One: Amygdala.

Gain entry into the Byrgenwerth lecture building, that drifts within the realm of nightmare.

Defeat Great One: Rom, the Vacuous Spider.

Defeat the Witch of Hemwick.