Here is the full list of all 13 Stories Untold achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Finish Episode 3.
Get out of the station.
Respond to the messages correctly.
Finish Episode 2.
Learn more about yourself.
Get things up and running.
Finish Episode 1.
Find the code.
Find the photographs.
Find all recordings in Ward 4.
Be hygiene conscious in Ward 4
Finish Episode 4.
Get all other achievements.