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