Taint Nobody Got Time For That

Easy Solo Achievement for Level 70 Dragonflight & Beyond...

1) Mythic Difficulty.

2) NUKE BOSS ASAP.

3) ?

4) Profit. Achievement Completed.

Taint of G'huun is applied by everything the boss does. This achievement is a burn for sure, and pretty much requires that you kill her before a second Blood Mirror. Stuff that applies Taint and how to avoid it listed below.

Blood Bolt - An interruptible cast from the boss. If one of these gets off, you're done.
Creeping Rot - She faces someone random and sends out a green puddle towards them. The closer you are, the quicker it is to move to the side and out of the way.
Sanguine Feast - She teleports to a random player and spawns a swirly that applies Taunt if you stand in it. Whoever she ports to needs to move right away.
Blood Mirror - Spawns a single Blood Troll add that does all the same mechanics as her. The second time she uses Blood Mirror it spawns two adds, and presumably so on though we never saw past a second phase.

We tried to do it at around 290 Ilvl and couldn't burn before a second Blood Mirror, but basically just dodge her Rot and Feast, kick all the Bolts, kick and nuke the add and kill her before Blood Mirror 2. She does virtually no damage for what it's worth, and you can easily get away without a healer (something we didn't try but will next time.

My btag is FrostyShot#1667 if you have any questions about the metas. (US Servers)

[npc=131318]'s abilities apply [spell=260685] to players whenever they deal damage, which means that all of her abilities will have to be interrupted and evaded in order to prevent this debuff.

To make the achievement easier, you can have your healer go dps so you have an extra interrupt, and also kill her faster.

If you need help with the other achievements, check this TLDR guide for all achievements: [guide=6418]