Complete Chapter 3 - New Acquaintances on any difficulty

Cap 25 enemy flags

Complete Chapter 1 - L.A. 2016 on any difficulty

Confronted Lamb's lieutenant in Pauper's Drop.

Researched a Splicer with the Research Camera.

Scored your first kill in a non-private match.

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.

Destroy the Abomination

Find a way into the Research Lab