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