Exorcist

Complete both the 'Ghosts' and 'Anomaly' levels without dying. These are the eerie, low-combat levels - Ghosts has the phantom visions, and Anomaly has the deadly moving anomaly you must flee and time your movement around. Play patiently: in Anomaly especially, watch its pulses and only move when it's safe. Die and you can just replay the level via chapter select and try again.