Apologies for if I am screwing this up. A guild mate usually does the post but he couldn't make raid tonight.
hmd MAGENTA from The Shadowlands
8m NiM Dread Master Styrak kill
9/16/13 @ 7:22 pm CST
Posting from my ipad a screenshot of the achievement from the kill at 7:22 pm CST. I am posting this at 3:35 am CST from my iPad so I'll include two image links. One of the screenshot for kill and one of the current UTC time. 5 hour time difference so UTC time should have been at 12:22 am UTC if I am converting properly.
(when I made this post)
Please let me know if you need anything else or prefer the actual achievements window over the kill screenshot.
Thanks for taking the time to keep this updated.