Acquiring this will require completing all 17 Bounties, issued by Caij from the Pyloon’s Saloon cantina, having first met the bounty hunter during the story. Taking on each bounty will require a Bounty Puck from Caij, unless you happen to randomly run into a target (this happened to us more than once while exploring). Vanquish all 17 bounties and return the pucks to Caij, then head to the location in the Devastated Settlement marked on your map for one final battle..

Star Wars Jedi Survivor - All Bounties Guide