I recently met all the criteria for the Champion of Ulduar achievement, but did not receive the achievement. I put in a ticket and the GM basically told me there is nothing Blizzard can do (Sounds about right). I love completing achievements and not receiving credit. Especially for bosses that require personal accountability. This is a a real easy one to repeat…
Hopefully this can be resolved and can somehow be granted credit.
Only boss needed was Flame Leviathan, not a single death in the log.
Find Warcraft Logs link below
https://classic.warcraftlogs.com/reports/t6Mg7BvQ8FdjPrVa#fight=12&type=deaths