Used a master point.

Unlocked the assassin.

Completed every side mission.

Unlocked the dark knight.

Completed a level 200 mission or higher on CHAOS difficulty.

Completed the game on CHAOS difficulty.

Acquired an anima crystal.

Completed a side mission.

Completed "A Fraught Journey."

Completed "The Suffering of Fools."

Completed "Schemes of the Past."

Completed "To Remember."

Completed "Phantoms of the Past."