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