Score a Diving Header

Complete story mission 1.

Acquire diamonds with your iron tools.

Smelt Wood Trunks using Charcoal to make more Charcoal.

Complete Level 15 - The Good, the Bad and the Hungry

Complete Level 13 - Magnetic Personality

Complete Level 11 - Taking Liberties

Recruit any of the Artisans and see them settled on the Homestead.

Complete Present - Skyscraper.

Be invited to join a Club.

Complete Sequence 3.

Re-Enter the Animus.

Break out of Abstergo.