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 the main game with the female protagonist
See the bad ending.
Encounter Hanako.
Find the message in the back of the laboratory.
Talk with Library multiple times.
Play the piano.
Save Kudoh.
Hide in a cardboard box.
Refuse to help Yoshino.
Have a meal.
Get a whiff of a toilet.
Jump off the rooftop.
Read "The Lazy-Eyed Ranger."
Read the diary in the library.
Check your key items.
Make a quicksave.
Clear the main game with the male protagonist.
Give Misao some coins
Free Kurata in the Truth route.
Clear Truth with the male protagonist.
Clear Truth with the female protagonist.