Most of you will get 1 or 2 of the achievements, but to make sure you get all 3, here is my long and detailed list!

Just play the game until you beat it once. You will know you have beaten the game when the doors open up and its all white.
DONT GO OUT when its foggy, that is not the exit

When the whole train gets foggy and comes to a halt, exit the train.
Once you are at the terminal in the middle of nowhere, walk around aimlessly until the achievement pops. (takes around 2-3 walk arounds) just follow the train track.

To make it clear, just keep walking in a straight line until it appears.

For this achievement you will need to find all anomalies in the game.
I'd recommend using this guide if you get stuck!
https://cs2bus.com/sharedfiles/filedetails/?id=3258119551

After finding all anomalies, the train will come to a halt at a terminal. You get off, follow the path until you reach The hallway from The exit 8. at that point the achievement will be unlocked

Thanks goodluck and all that