Here is the full list of all 14 Clover Day's Plus achievements.
Launch the game
Start Anzu's route
Start Anri route
Start Hekiru & Hikaru route
Start Tsubame route
Start Izumi route
Finish Anzu route
Finish Anri route
Finish Hekiru & Hikaru route
Finish Tsubame route
Finish Izumi route
Meet Torakichi
Defeat Demon King Asurin
Unlock all other achievements