Find the secret door to library.

Complete the game (any difficulty)

Find all inspect items

Incinerate 15 enemies

Inspect all newspapers

Inspect all objects

Kill an enemy with every weapon

Kill 15 enemies with melee attacks

Kill 100 enemies with a headshot

Kill 40 enemies with science weapons

Kill 5 enemies with a headshot during Blacksight

Shoot an airborne grenade during Blacksight

Completed the "Sub-Level 13" missions with 3 other players.