I See... Absolutely Nothing

Pretty straight forward achievement, although a massive troll. When you enter the boss room, go to the right near the tents and you will see the blindfold on the floor. Picking it up will give you an extra action button. Using the item will give you a Demon hunter lore accurate POV for 1 minute ( you will still see the bosses, but nothing else, meaning this can get ugly real quick). When the fight started, we ALL popped the blinds and survived for 1 minute, then we simply did the fight as normal

P.S : Demon hunters will see normally while using the item...

This achievement is hilarious as a Demon Hunter. You can still see just fine. The only change is that you have the flames around your screen like Spectral Sight.

About what you see: You will see outlines of the bosses, and also of fractues ghosts etc. You will not see puddles on the ground etc. So it's quite playable on normal, esp. with some gear. Using the item at the start of the fight makes it easier as some boss abilites take some time to first occur and then "going dark" phase is already over