No Doubt

No Doubt is a Torghast, Tower of the Damned achievement given to players who do not interrupt or kill the Mawsworn Doubtcaller while fighting the layer boss on floor five of any normal Torghast run. The doubtcaller only spawns when the "Backup" Torment is active.

One strategy is to just simply blow up the boss before the doubtcaller gets any casts off...