Complete Story Mission: A Terrible Reaction.

Unlock 3 Heat-Clearing Priests by completing Encounters.

In Blackout, unlock Battery, Ruin, Firebreak, Seraph, Nomad, Prophet, Ajax, Crash, Torque and Recon

Get 1,000 Chaos.

Plunder 30 ships.

Harpoon a killer whale.

Swim a total of 1 nmi.

Kill 5 guards at once with a blunderbuss.

Kill a guard ringing a bell.

Played as Aiden for the first time.

Comet Drop on three coughing enemies

Dash through two red air vents without touching the ground and then Comet Drop on an enemy

Finish the game on Expert difficulty