Retrieve Chief Zahn's Zoni Vessel.

The player has completed the game without harvesting any Little Sisters

The player has become a Big Daddy

Fully upgrade four weapons

The player has fully upgraded three weapons

The player has defeated Andrew Ryan

The player has purchased every slot in one of the Plasmid or Tonic tracks

The player has completed Sander Cohen's great masterpiece

Complete the game on any difficulty. (Solo only)

Survive the conflict in Okinawa on any difficulty. (Solo only)

The player has restored the forests of Arcadia

The player has fully upgraded one weapon

The player has successfully completed 50 hacks