In Rise of the Empire during the Felucia level, to kill Acklay as a clone get to a high place where the Acklay can't reach you and shoot. The Elite Rifle and Flechette Shotgun are also extremely effective at destroying them. Alternately, you can also use Mines or Rocket Launchers to kill them.*501st Legion assault 501st Legion assault: Focus on killing droids and capturing point 5. These are the most vital things.