Place a sticker or a decoration on another player's sackperson

Get a 2X Multiplier

Choose a costume for your sackperson with at least one item on your head, at least one item on your body, and a material

You completed the mission "Museum Piece".

You unlocked all the islands.

The player has completed the game without harvesting any Little Sisters

The player has become a Big Daddy

The player has either Harvested or Rescued every possible Little Sister

Take at least one photo in every research group

The player has successfully invented all possible ammo types

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

The player has restored the forests of Arcadia