Phillak is the Ram looking animal. This animal is on many planets. But I got mine on Zeffo.
Maneuver behind the animal until it kicks you (headbut does not count) Then follow down below
Continue running around the monster to provoke it to attack - it must be a normal attack, not the red one! Press the dodge button (Circle on the controller) at the right moment and follow it with an attack (Square on the controller). Cal should kick Phillak instead of using the lightsaber. After that, you should get the trophy/achievement.