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