Here is the full list of all 15 My Klutzy Cupid achievements.
Reached Kotohina's ending.
Obtained all achievements.
Started Kotohina's route
Reached Rinka's ending.
Reached Isuzu's ending.
Reached Kururu's ending.
Reached Eil's ending.
Started Uta's route
Reached Masora's ending.
Reached Uta's ending.
Started Rinka's route
Started Izusu's route
Started Kururu's route
Started Eil's route
Started the game