Joined forces with Sinclair in Ryan Amusements.

Bought one Plasmid or Tonic Slot at a Gatherer's Garden.

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.

Kill 6 enemies in a row using a thermal weapon in Single Player or Special Ops.

Complete the mission in the airplane graveyard.

Kill 2 rappelling enemies in a row before they land on their feet in Single Player or Special Ops.

Execute the plan to help the Americans.

Use a riot shield to beat down an enemy in Single Player or Special Ops.

Kill at least 10 enemies with one Predator missile in Single Player or Special Ops.

Infiltrate the snowy mountain side base.

Kill 2 enemies with a single bullet in Single Player or Special Ops.