STAR WARS: Bounty Hunter

Story related and cannot be missed.

Complete the missions "Longo Two-Guns", "Tusken Canyon" and "Gardulla's Palace" and the trophy will pop during the mission status screen. If you are in a hurry, then you can use the cheat code "MANDALORIANWAY" and skip all the missions except Gardulla's Palace.

Boss Tactics:

This is another extremely easy boss fight. After killing the big guy in the cutscene simply dash with your Jet pack to the far left side of the chamber, dodging missiles while doing so. Drop down on the ground floor so you are below the missile launcher (and far away from the other one on the other side of the chamber) then just stand in place and shoot the monster, rockets makes it go faster if you got any left and of course do dodge his ground slam.