Confronted Lamb's lieutenant in Pauper's Drop.

Maxed out one Research Track.

Paid your respects to the founder of Rapture.

Defended yourself against the Big Sister without dying.

Adopted a new Little Sister for the very first time.

Upgraded a weapon at a Power to the People Station.

Killed an enemy with its own projectile.

Found your way back into the ruins of Rapture.

Complete the game on Survivor difficulty without using a Vita-chamber

The player has completed the game on the Hard difficulty setting

The player has completed the game without harvesting any Little Sisters

The player has either Harvested or Rescued every possible Little Sister