Story related, you will get this after completing "Worse Then Dying"
The whole mission is pretty straight forward except......
To solve the door puzzle, have the
GREY "line with a small circle above it" in the NW position, and have the
GOLD "7 with a small circle above it" in the SE position.
At the very end of the mission you will have to climb to where the lightning is striking, you will have an almost hidden QTE where the screen flashes white & you need to mash
The achievement will unlock after the cutscene