Crypt Couture

To earn Crypt Couture after completing all required quests, there are several drops and quests around Maldraxxus

Ashen Ink drops from Zargox the Reborn at /way 28.8 51.6

Mucosal Pigment drops from any slimes, droplets, oozes, including rares and the giants near the House of Plagues and Plaguefall.

Jagged Bonesaw drops from Collector Kash at /way 49.6 23.6

Discarded Grimoire is a reward from A Fatal Failure picked up from Captain Prateq located at /way 70.4 27.8

Sorcerer's Blade is a reward from Casting Doubt which starts by picking up Sorcerer's Note on the ground in the Vault of Souls, on a small bookcase. Entrance to the Vault at /way 71.0 28.5

Amethystine Dye is a reward from Regalia de Rigueur picked up from Moret the Vogue at /way 71.6 32.8

Ritualist's Mantle is a reward from Mantle of Mastery picked up from Ton'hamil at /way 67.8 30.6

This achievement requires you to progress in the Necrolord campaign and infiltrate the House of Rituals (This should be Chapter 8, which is available around week 7 of the expansion, but not 100% sure on campaign gating times on Live) . Once you disguise yourself as an Acolyte, several additions can be added to your disguise, either from quests around the area, or rares. As you increase your disguise options, the toy Acolyte's Guise will gain increasing additions.

I'm unsure why this achievement is listed under exploration and not under "Expansion Features/Covenant" like other specific covenant achievements. Here's a screenshot from the beta of achievement progress as proof that the achievement isn't possible for a while and necrolord only: https://imgur.com/a/QOouUCG

How hard can it be for Blizzard to place this achievement where it belongs?
It should be Expansion Features -> Covenant Sanctums + active only for Necrolords (since you can't complete it with other covenants)
Instead it's randomly under exploration and active for every covenant... What is this, and why has it not been fixed in 5 months in the expansion? I really don't get it. Reported it 3 times now as a bug.