Here is the full list of all 21 Misao: Definitive Edition achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Clear Truth with the male protagonist.
Clear Truth with the female protagonist.
Give Misao some coins
Free Kurata in the Truth route.
Clear the main game with the male protagonist.
Hide in a cardboard box.
Refuse to help Yoshino.
Find the message in the back of the laboratory.
Talk with Library multiple times.
See the bad ending.
Clear the main game with the female protagonist
Play the piano.
Save Kudoh.
Read "The Lazy-Eyed Ranger."
Encounter Hanako.
Check your key items.
Get a whiff of a toilet.
Read the diary in the library.
Jump off the rooftop.
Have a meal.
Make a quicksave.