Here is the full list of all 19 AudioSurf achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Make a candy stripe.
Collect a chain reaction of 7 white blocks.
Dethrone a friend from a global scoreboard.
Beat a friend's score less than 15 min. after they earn it.
Fill all columns within 15 seconds. No greys. No matches.
Finish Clean, Gold before finish, hit last block, elite only.
Collect matches in 4 colors simultaneously.
Collect a match of 24 blocks.
Using Ninja Mono, earn Stealth. 3 min minimum.
Using Ninja Mono, earn Stealth. 7 min minimum.
Using Ninja Mono, earn Stealth. 11 min minimum.
Stealth and collect every color block. 3 min minimum.
30000 points per minute. 3 minute minimum.
Turn 21 blocks red with a single paint.
Score 17000 points in a single match.
Earn Clean Finish and Gold 3 times in a row.
10000 points per minute. 3 minute minimum.
Earn Gold without overfilling. 2 min minimum.
Earn triple a gold medal requirement. 2 min minimum.