Here is the full list of all 27 How to Sing to Open Your Heart achievements.
You've unlocked all of the Achievements!
You've unlocked all of the CGs.
You've got the Teamwork Route Ending!
You've unlocked all of the Music tracks.
You've cleared Chapter 8★Teamwork!
You've cleared Chapter 7★Teamwork!
You've cleared Chapter 6★Teamwork!
Nothing can suppress this feeling anymore.
You've cleared Chapter 5★Teamwork!
You've cleared Chapter 4★Teamwork!
You've cleared Bonus★Teamwork 3!
You've cleared Bonus★Teamwork 2!
You've cleared Bonus★Teamwork 1!
You've got the Independent Route Ending!
You've cleared Chapter 8★Independent!
You've cleared Chapter 7★Independent!
You've cleared Chapter 6★Independent!
We don't need words to express this feeling.
You've cleared Chapter 5★Independent!
You've cleared Chapter 4★Independent!
You've cleared Chapter 3!
You've cleared Bonus★Independent 3!
You've cleared Chapter 2!
You've cleared Bonus★Independent 2!
You've cleared Chapter 1!
You've cleared Bonus★Independent 1!
You've cleared the Prologue!