Here is the full list of all 17 Amabilly achievements.
Get 25 gems.
Get 50 gems.
Get 100 gems.
Get 200 gems.
Get 10 musical notes.
Get 25 musical notes.
Get 50 musical notes.
Get 100 musical notes.
Get 101 musical notes
Defeat 25 enemies.
Defeat 50 enemies.
Defeat 100 enemies.
Defeat 200 enemies.
Defeat the first boss.
Defeat the second boss.
Defeat the third boss.
Defeat the last boss.