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.
Save Kudoh.
Find the message in the back of the laboratory.
Jump off the rooftop.
Encounter Hanako.
Get a whiff of a toilet.
Play the piano.
Have a meal.
Hide in a cardboard box.
Refuse to help Yoshino.
Read the diary in the library.
Read "The Lazy-Eyed Ranger."
Talk with Library multiple times.
Check your key items.
Make a quicksave.