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.
Turn 21 blocks red with a single paint.
Fill all columns within 15 seconds. No greys. No matches.
Using Ninja Mono, earn Stealth. 11 min minimum.
Finish Clean, Gold before finish, hit last block, elite only.
Using Ninja Mono, earn Stealth. 7 min minimum.
Score 17000 points in a single match.
Stealth and collect every color block. 3 min minimum.
Collect a match of 24 blocks.
Beat a friend's score less than 15 min. after they earn it.
Earn Gold without overfilling. 2 min minimum.
Using Ninja Mono, earn Stealth. 3 min minimum.
Earn Clean Finish and Gold 3 times in a row.
10000 points per minute. 3 minute minimum.
30000 points per minute. 3 minute minimum.
Collect matches in 4 colors simultaneously.
Collect a chain reaction of 7 white blocks.
Dethrone a friend from a global scoreboard.
Earn triple a gold medal requirement. 2 min minimum.