Here is the full list of all 14 Within Skerry achievements.
Complete any ending of Within Skerry in 25 minutes or less
Get off the kitchen counter!
Unlock all vault spinners
Locate all notes
Complete Within Skerry by achieving the third ending
Snap 15 photos of paranormal activities
Snap 10 photos of paranormal activities
Unlock the little white marble vault
Complete Within Skerry by achieving the second ending
Locate the holy cross to help fend off evil
Captured by the enemy running after you
Complete Within Skerry by achieving the first ending
Escape the enemy trying to capture you
Collect all cassettes