Here is the full list of all 23 Hashihime of the Old Book Town achievements.
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.
Fell in your first puddle.
Survived the night at the café.
Took Naoshi's hand.
Took Hanazawa's hand.
Grabbed Professor's arm.
Took the prayer beads.
Discovered the identity of the Shopkeeper.
Completed Minakami's route
Completed Kaoru's route
Watched the play with Kawase.
Survived Hanazawa's dream.
Met another Professor.
Completed Professor's route
Created a new character.
Kawase gained the power of the hashihime.
Completed Kawase's route
Completed Hanazawa's route