Bringing Down The Sky Achievement Bugged

I am on the Xbox Series X and this achievement is bugged.

I have faced every single high dragon in the game except Mythal in dragon form and the achievement will not pop. I opted to go for the peaceful route for her.

According to every site online about this achievement the only dragons I need to kill are as follows which I've already taken down in my game.

Fangscorcher, The Formless One, Revenant Dragon, Kataranda the Stormrider, Kaltenzahn.

I've even killed the two blighted dragons the ice dragon and the fire dragon already. Frankly this achievement according to all online websites and even videos state it should be done by now.

Another major bug for another achievement.