Here is the full list of all 30 Dub Dash achievements.
Complete Massive Dance.
Collect 1 note.
Complete Massive Dance in practice mode.
Complete Flying High in practice mode.
Complete Sound Ward in practice mode.
Complete Milky Ways in practice mode.
Complete Dub Dash in practice mode.
Complete Midnight Sun in practice mode.
Complete Anti Headache in practice mode.
Complete Helium in practice mode.
Complete Dubstep Rock in practice mode.
Complete Flying High.
Complete Sound Ward.
Complete Milky Ways.
Complete Dub Dash.
Complete Midnight Sun.
Complete Anti Headache.
Complete Helium.
Complete Dubstep Rock.
Collect 3 notes.
Collect 9 notes.
Collect 16 notes.
Collect 24 notes.
Play 2.500 beats.
Play 25.000 beats.
Play 250.000 beats.
Make 100 attempts.
Make 1.000 attempts.
Make 10.000 attempts.
Make 50.000 attempts.