Here is the full list of all 10 Notice Me Leena-senpai! achievements.
Play the game for the first time.
Complete the Cafeteria at Magic School.
Complete the Library at Magic School.
Complete Magic School.
Complete The Park.
Complete the Amusement Park.
Complete the Crystal Cave.
Complete the Dimensional Volcano.
Complete Valinova the Royal Capital.
Complete Nightmare Realm.