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