Defeated 3 Big Daddies without dying during the fight.

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

Defended yourself against the Big Sister without dying.

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.

Kill the Pighead.

First kill with a Nail Bat.

Release Oswald from his Trap.

First kill with a Gun.

Release Melissa from her Trap.

Stomped first Minion to death.

Unlock 5 locked doors.