Destroyed Lance Depot

Destroyed a Lancer while in a Racer

Kill 2 enemies with one shot with the shotgun

Confronted Lamb's lieutenant in Pauper's Drop.

Reached Level 51

Installed the third upgrade to a weapon.

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

Researched a Splicer with the Research Camera.

Defended yourself against the Big Sister without dying.

Paid your respects to the founder of Rapture.

Hacked one of each kind of machine.

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

Found your way back into the ruins of Rapture.