Here is the full list of all 19 AudioSurf achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Dethrone a friend from a global scoreboard.
Beat a friend's score less than 15 min. after they earn it.
30000 points per minute. 3 minute minimum.
Fill all columns within 15 seconds. No greys. No matches.
Finish Clean, Gold before finish, hit last block, elite only.
Using Ninja Mono, earn Stealth. 11 min minimum.
Using Ninja Mono, earn Stealth. 7 min minimum.
Stealth and collect every color block. 3 min minimum.
Collect matches in 4 colors simultaneously.
Collect a chain reaction of 7 white blocks.
Collect a match of 24 blocks.
Score 17000 points in a single match.
Turn 21 blocks red with a single paint.
Make a candy stripe.
Using Ninja Mono, earn Stealth. 3 min minimum.
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.