Yeah this is an annoying change. They removed the bugged achievement, but the larger achievement still requires it. Luckily, even though the achievement is no longer, you can still get it for the over all one. Just go kill a Kath Hound on Alderaan, Bogwing on Belsavis, and you should've already killed an Asharl Panther on Ilum during Relics of the Gree.