Found your way back into the ruins of Rapture.

The player has completed the game on the Hard difficulty setting

The player has defeated Atlas

The player has become a Big Daddy

Fully upgrade five weapons

Purchased every slot in all four Plasmid and Tonic tracks

Collect or Invent 58 Tonics in the Physical, Engineering and Combat tracks

Max out all possible research

Fully research the Nitro Splicer

The player has fully upgraded two weapons

Fully research the Bouncer

The player has taken a picture of Sander Cohen's corpse

Take at least one photo in every research group