Overview
This guide shows you how to get out of the map without cheating and how to get the achievements ‘Wrong Place to Bury’, ‘Back to School’ and ‘No Swimming’!
Getting Outside & The Church
In act 3, go up this painting (assuming you’ve already opened it) and go up the ramps twice. Open the door at the top of the second ramp, and sprint jump to a visable ledge. Look to the wall on your left to see a patch that looks rather different to the rest of the wall. 
Crawl through to reach this area with a dark doorway.
Go through the doorway and walk into th ‘script missing’ circle.
You will find yourself in a graveyard OUTSIDE the map. Walk around a bit to get your first achievement.
The School & Achievment no. 2
There is a space in the fence around the graveyard you can go through. Just walk down hill a little bit to find yourself at a school.
Walk around a bit to grab the achievement.
The Factory & Achievement no.3
From the school, you should see a large hill with a lake at the bottom. If you swim in the lake, you will die. Go up the hill to find yourself at not only the factory, but the edge of the world.
Go to this place around the factory for achievement no. 3
That’s it.
Thanks for checking this guide out, I hope it helps!
Note that whatever item your holding when you go through will dissapear and you can’t get it back.
(Also if you want to get back to the game, die of fall damage or something)