Complete a quest.

Exploit an enemy's weakness.

Stagger an enemy.

Clear Mission 10 as Nero, Dante, or V.

Clear Mission 08 as Nero, Dante, or V.

Fend off a menace from above in Mission 05 as Nero, Dante, or V.

Clear Mission 03 as Nero, Dante, or V.

Clear the Prologue Mission as Nero, Dante, or V.

Obtain a key by completing the sixth Riddler trial.

Obtain a key by completing the fourth Riddler trial.

Obtain a key by completing the second Riddler trial.

Beat the game on any difficulty

Find the source