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.
Make a candy stripe.
Beat a friend's score less than 15 min. after they earn it.
Using Ninja Mono, earn Stealth. 11 min 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. 7 min minimum.
Collect matches in 4 colors simultaneously.
Collect a chain reaction of 7 white blocks.
Score 17000 points in a single match.
Collect a match of 24 blocks.
30000 points per minute. 3 minute minimum.
Using Ninja Mono, earn Stealth. 3 min minimum.
Stealth and collect every color block. 3 min minimum.
Earn Clean Finish and Gold 3 times in a row.
10000 points per minute. 3 minute minimum.
Turn 21 blocks red with a single paint.
Earn Gold without overfilling. 2 min minimum.
Earn triple a gold medal requirement. 2 min minimum.