Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops.

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

Confronted Lamb's lieutenant in Pauper's Drop.

Researched a Splicer with the Research Camera.

Defended yourself against the Big Sister without dying.

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.

Became a Big Daddy for the first time in a non-private match.

Took down your first Big Daddy in a non-private match.

Completed your first non-private match.

Earn 21 stars in Special Ops.