Unlocked on hitting 50% game completion (Single Player Only)

Complete Year 8

Complete "Snape's Tears"

Complete DNA Sequence 2.

Unlock all 20 pieces of Subject 16's video.

Kill Zeus

Solve the Three Judges

Escape the hideout.

Reach 80% of your stronghold's total value.

Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.

Defeat an enemy with a knife.

Get 12 Gold Medals on Alps Public Challenges

Find and unlock 10 Drop Zones in Alps