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