Once completed and outside of a mission, open your pause menu (Esc key for PC users), choose Progress Tracker, select Sequence 2, Memory 3, and start a replay of that same mission. The first requirement is to complete the mission 'Mister Walpole, I presume?' which is Sequence 2 Memory 3 of the main story. Shiver Me Timbers - Finish 80 Abstergo Challenges.

Scourge of the Seven Seas - Finish 40 Abstergo Challenges. Poseidon's Will - Finish 60 Abstergo Challenges. No Quarter - Finish 30 Abstergo Challenges. Loaded to the Gunwhale - Finish 50 Abstergo Challenges. (Note: You cannot save the game while these are in use.)Īrmed to the Teeth - Finish 90 Abstergo Challenges.Īrrr Matey! - Finish 20 Abstergo Challenges.Ĭelestial Navigation - Finish 10 Abstergo Challenges.ĭead Men Tell No Tales - Finish 70 Abstergo Challenges.ĭeceased Crew - Finish all 100 Abstergo Challenges. They can be found in the Cheats option in the Abstergo Challenges menu.

If you finish enough Abstergo challenges - as below - you will unlock the named cheats.