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