My hunter Kierakay-Aerie Peak is not getting credit for the achievement “Runed of the Ethereal” all of my gear slots are either 704, 707 or 727. Why am I not getting credit?
I dunno. At least according to the Armory, your loadout isn’t showing any of the obvious user errors (wrong armor type, wrong primary stat for class/spec, that kind of thing).
Has this persisted through logout/login cycles?
It is entirely possible that one of your trinkets has been determined by Blizzard to not be appropriate for your class: Ara-Kara Sacbrood.
Wowhead shows it dropping from both Ki’katal the Harvester and Avanoxx, when I switch to class-specific dropping, Ara-Kara Sacbrood does not appear listed for any class. Usually, I would assume this means the item works for all classes, but Blizzard’s QA lately has not been great.
To make sure, try swapping the positions of your trinkets and repeat this for your rings. If you do not get the achievement from that, it is a bug of some kind that a game master won’t be able to fix.