Maneater

This means every body part that you can equip: Head, Body, Tail, Fins, and Organs. I unlocked it when I got my 14th part doing the Infamy levels. This included the Sonar you automatically have and the Tiger body you are given at the start. You'll get this just playing the story getting the Bone Set pieces and completing the infamy levels giving you the Bio Electric Set pieces and various Organs.