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