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
Clear Truth with the male protagonist.
Free Kurata in the Truth route.
Give Misao some coins
Clear the main game with the male protagonist.
See the bad ending.
Find the message in the back of the laboratory.
Play the piano.
Hide in a cardboard box.
Refuse to help Yoshino.
Save Kudoh.
Have a meal.
Encounter Hanako.
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.
Talk with Library multiple times.
Make a quicksave.