Here is the full list of all 9 The Upside Down achievements.
Thank God fuel regenerates!
First one but sure not the last one!
First step for me, but biggest step for the "Black Sky"
I have to say, this weapon is powerful!
Running low on Oxygen!
Portal to the Upside Down!
Top Secret Laboratory located in Wankings, Indiana
Raising Suspicion
Welcome to the game!