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.
Ornithologist on paper
Earn all achievements
Gather all origamis in act 4.
Gather all origamis in act 3.
Gather all origamis in act 2.
Gather all origamis in act 1.
Finish the story.
Do not rewind during the 5th scene of the backstage
Finish act 3.
Take a moment to breathe when advised to.
Finish act 2.
After you! No, after you!
Fnish act 1
Hear The Other for the first time.
Finish the exposition.
Get all origamis in the introduction