Here is the full list of all 32 Runas School Story achievements.
Attend classes
Meet the ghost
Visit the arts class
Solve the 1st puzzle
Visit the chemistry class
Get out from the chemistry class
Visit the music class
Solve the 2nd puzzle
Visit the changing room
Restore energy in the gym
Solve the 3rd puzzle
Visit the teacher’s room
Get out from the teacher’s room
Visit the library
Solve the 4th puzzle
Visit the locker room
Solve the 5th puzzle
Restore energy
Solve the 6th puzzle
Visit the meeting room
Sneak in to the headmaster’s office
Visit the headmaster’s office
Solve the 7th puzzle
Visit the school nurse's office
Solve the 8th puzzle
Collect all shards of the soul
Get out of school
Free the ghost of the school
Wake up in the class room
Watch titles
Restore the ancient tablet
No to be good at catching things