Liberate all districts in Boston OR New York.
Complete Sequence 6.
Upgrade the Aquila.
Explore Fort Wolcott.
Retrieve every page for one of Ben Franklin's Almanacs.
Complete Present - Skyscraper.
Complete Sequence 5.
Recruit any of the Artisans and see them settled on the Homestead.
Be invited to join a Club.
Complete Sequence 4.
Complete Sequence 3.
Complete Sequence 1 & 2.
Re-Enter the Animus.
Involves heavy lifting
Continue playing to unlock this secret achievement.
Achieve a Ghost skill rating of above 90% on one mission
Have a guard incapacitate 3 civilians while he's poisoned.
Complete DNA Sequence 9.
Complete DNA Sequence 8.
Complete DNA Sequence 7.
Complete DNA Sequence 6.
Complete Desmond Sequence 1.
Complete DNA Sequence 5.
Complete the Hagia Sofia challenge level.
Collect all of Ishak Pasha's memoir pages.
Control all cities (except Rhodes) simultaneously in the Mediterranian Defense game.
Find and beat up Duccio.
Complete DNA Sequence 4.
Have seven trainees reach the rank of Master Assassin.
Complete DNA Sequence 3.
Have one trainee reach the rank of Master Assassin.
Get your money back from a Templar tax collector.
Assassinate 50 guards with the hidden blade.
Complete DNA Sequence 2.
Complete DNA Sequence 1.
Complete the level "343 Guilty Spark" on any difficulty.
Complete the level "Assault on the Control Room" on any difficulty.
Pilot a Banshee on the level "Assault on the Control Room."
Get eaten by the Kraken 10 times
Complete the level "The Silent Cartographer" on any difficulty.