Here is the full list of all 16 Shady Part of Me achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Finish the story.
Earn all achievements
Ornithologist on paper
Gather all origamis in act 4.
Do not rewind during the 5th scene of the backstage
Finish act 3.
Gather all origamis in act 3.
After you! No, after you!
Finish act 2.
Gather all origamis in act 2.
Take a moment to breathe when advised to.
Fnish act 1
Gather all origamis in act 1.
Hear The Other for the first time.
Finish the exposition.
Get all origamis in the introduction