Here is the full list of all 10 Lurk in the Dark : Prologue achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
After winning all achievements, watch a credit.
After entering the residence, try to return from the door behind you.
At a specific timing, try to peek under the closed door in the restroom.
Try pressing the shutter button in annex.
Enter the residence.
Solve the mystery of the desk.
Something under the bed......Hmm...
After the crying stopped, look into the hole in the wall again...
Collect all items and files in one game play.
Move forward without fear.