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