Here is the full list of all 13 AVSEQ achievements.
Detonate 250 max length chains
Detonate 10 max length chains
Complete all stages
Place 500 notes
All stages unlocked
Detonate 50 max length chains
Place 250 notes
Unlock half the stages
Place 100 notes
Place 50 notes
Complete a stage without losing any notes from the grid
Complete a stage without any atoms hitting the bottom