Here is the full list of all 14 Sakura Melody achievements.
What a live performance
Gain a huge following
Nail your first stage performance
Gain a small following
Publish your first CD
Accept your first agency gig
Appear on a TV show
Win the idol competition
The Protein Princes win the competition
Achieve Akko's ending
Achieve Ibuki's ending
Achieve Chiyoko's ending
Achieve the Harem Ending
Everybody should have heard of you by now