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.
Encounter Hanako.
Clear Truth with the female protagonist.
Free Kurata in the Truth route.
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.
Hide in a cardboard box.
Get a whiff of a toilet.
Have a meal.
Read "The Lazy-Eyed Ranger."
Read the diary in the library.
Talk with Library multiple times.
Check your key items.
Make a quicksave.