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