I'm perfectly fine with Ultimate Hunter being exactly as it currently stands.
I very much dislike breaking it up into micro-achivements for zones, so I have to hunt down many enemies that might not even be around until a server restart, just to get the 'you did everything this zone directly offers you!' achievement.
Keep your Ultimate Hunter. It's fine. But don't make me do it. That's why I proposed the "Hunter" Catagory in Achievements . It would also allow a better UI organization once more zones get introduced.
And the artifact ones I 'headcanon' away as finding rare trinkets in the common market. I don't see how confusing that is for you. Many of them I'm paying 5+ plat for, which is a pretty penny for a leveling character.