Got a ★x 5 Ninja Info Card.

Got A rank in The Nine Tails' Attack.

Successfully performed a Secret Action.

Find 75% of all documents.

Force an enemy to drop dynamite that kills two people when exploding.

Purchase all skills in one category.

Kill 25 unaware enemies.

Perform 50 headshot kills in the single player campaign.

Complete one challenge.

Complete one optional tomb.

Find 25% of all documents.

Defeat 20 enemies by blind-firing while in cover (without aiming with L1/R1)

Find 20 treasures