Here is the full list of all 16 Backrooms Descent: Horror Game achievements.
You have entered the Backrooms!
All you know is, this place shouldn't be so dark
You have reached the parking lot
You have entered the Pipe Dream
You've found a calm place
You have entered the deep parts of the Poolrooms
You have entered the Infinite Hotel
You've found more than 100 of them, a true survivor
You've been killed by the Bacteria
You've been killed by the SkinStealer