Just a PSA, I got the achievement yesterday for the Sylvanus/Void raid, where you have to have everyone get a flesh debuff thing, and during the fight everyone has to throw the fleshy thing at Sylvanus during two moments. The trick is everyone has to have the debuff, and throw it during two moments, all the while the debuff cuts down you max health by 30%.
Well, sad to say, during the several attempts that did lead to getting the achievement, we found Ice Blick and other abilities the remove debuffs from self, would remove the debuff.
Strangely, cleanse xast on a player did not seem to do that.
So… I hope this helps others that would seek that achievement.