Full list of all 24 Outlast 2 achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox One.
Spent 10 minutes underwater
Used 10 bandages
Crawled for 500 meters
Performed a twelve-meter blood slide
Finished the game
Finished the game in Hard Mode
Finished the game in Nightmare Mode
Finished the game without hiding in a barrel or closet
Completed all recordings
Witnessed the end
Reunited with Lynn
Collected all documents
Used the microphone for 20 minutes
Descended into the mines
Reached the mine facility
Escaped from the Scalled
Completed 30 recordings
Collected 40 documents
Escaped the crucifixion
Saw the distant mines where Lynn was taken
Found Lynn
Finish the game in Insane Mode
Finish the game in Insane Mode without reloading the camera battery
Finish the game in under 4 hours