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