NOTE: This achievement guide has spoilers that lead to the solutions of puzzles you may want to solve yourself. I have spoiler tagged some important information, so proceed with caution.
This achievement takes place in the Dolores' chapter (started by interacting with the key hanging on the wall, to the left of the radio). Late into the chapter you will come across a
that you will need to use to break down a
. The wall is located near the door that leads to a small tool closet. You'll know which wall to break down as it's
, and will give you an "interact" prompt. Once you break down the wall, walk through it. You will come to a room with a Revolver that you will need to use to get back upstairs. Using the Revolver will give you the achievement. Just know that this Revolver only has 6 bullets, and is also required for another achievement that I will have linked at the bottom of this guide. To get back to the Revolver, go down the stairs that lead to the Garage, and head through the mirror at the bottom. If you are wondering how to get back upstairs without using bullets, head into the bathroom near the Supply Closet, and there will be a missing toilet. Head down the hole, and you will be back upstairs.
Void ending achievement guide: Solution for Void in Visage