Overview
This is how to exactly get the achievment, no joke, no random nonsense.
Unlocking
To get the achievement, you have to close the game if you are in i, look for the file in the steam folder, mine is C:Program Files (x86)SteamSteamAppscommonThe Stanley Parablethestanleyparablecfg.
Make a new line and put in this.
bind “x” “~;_u”
It’s easier to copy and paste.
Save it, right-click and click properties.
Set it as read only so it doesn’t change it.
Go into The Stanley Parable.
Play.
Press X.
Wait a few seconds.
Notes
I’m not sure how the achievement was suppose to work, but supposedly, a patch was released that made this work.
Hope this helps!