So forgive me if someone has mentioned this already, but I’ve been going back recently and doing all the pandaria achieves I missed. While doing that I came across this achievement and realized that domination point (the area where the rares for the achiev were) is no longer in krasarang wilds. Were the rares moved? Or is there a scenario or something so that you can kill them? I haven’t found anything to that effect and I’d imagine they’d move the achievement to the legacy tab if they weren’t still in-game.
I could be wrong but I think that achievement was tied to an area that you needed to complete the quest chain to unlock. You have to build up that foothold first.