Complete Sequence 1 & 2.

Re-Enter the Animus.

Find all documents, relics and GPS caches.

Complete all challenges.

Complete all optional tombs.

Find 75% of all documents.

Shoot a bundle of dynamite out of the air.

Collect 75% of all relics.

Find 75% of GPS caches.

Kill 75 enemies with the rifle.

Perform 50 headshot kills in the single player campaign.

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