Adept Dredge Bugged

Arqueus

Platform: PC

So I've been trying to get Adept Dredge for a couple of hours spread out between three days, but I just got a Mercilless Killer win, with Iridescent Emblems and all, and the game still hasn't recognized that I got the achievment. Some poeple have said they've already gotten the achievement, so I don't know why despite me getting a Merciless victory, and killing all survivors no less, I still didn't get the achievement. Please, I'd like to know if this can be possibly fixed.

Steps to reproduce: Unsure

It has happened 2 times already counting the one I'm describing above.