Perform an Air Assassination on a Poisoned NPC.

Joined forces with Sinclair in Ryan Amusements.

Adopted a new Little Sister for the first time.

Defended yourself against Lamb's assault in the train station.

Found your way back into the ruins of Rapture.

Retrieve the second artifact

Survive trial by combat

Kill two enemies with one throw of the Battle Disc

Defeat the Matriarch

Find the Youngbloods in the Jungle

Escape from the Research Lab

Escape from C-Block

Solve 25% of riddler challenges