Collect the Crossblade

Complete Blood Meridian on any difficulty level

Kill 3 Helghast using an M82 or StA52 assault rifle without releasing the trigger

Gain the Shadowflight Ability

Collect the Earthcaller

Play the game after a week long break.

Finish the Ballad. (The Ballad of Gay Tony)

Beat the Labyrinth without dying or failing

Beat the Challenge of Olympus

Complete the story mode on any difficulty

Knock out 20 enemies in melee combat

Complete the Trinity. (The Ballad of Gay Tony)