Here is the full list of all 23 Hashihime of the Old Book Town achievements.
Completed Kawase's route
Kawase gained the power of the hashihime.
Created a new character.
Watched the play with Kawase.
Took Naoshi's hand.
Completed Minakami's route
Discovered the identity of the Shopkeeper.
Survived the night at the café.
Fell in your first puddle.
Met the Giant of Jinbouchou.
Received Hanazawa's pocket watch.
Lost your best friend.
Received tin goldfish watering can.
Received movie ticket.
Welcome to Jinbouchou.
Took Hanazawa's hand.
Grabbed Professor's arm.
Took the prayer beads.
Completed Kaoru's route
Survived Hanazawa's dream.
Met another Professor.
Completed Professor's route
Completed Hanazawa's route