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.
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.
Earn Clean Finish and Gold 3 times in a row.
30000 points per minute. 3 minute minimum.
Collect matches in 4 colors simultaneously.
Make a candy stripe.
Collect a chain reaction of 7 white blocks.
Stealth and collect every color block. 3 min minimum.
Score 17000 points in a single match.
Turn 21 blocks red with a single paint.
Collect a match of 24 blocks.
Fill all columns within 15 seconds. No greys. No matches.
Using Ninja Mono, earn Stealth. 3 min minimum.
10000 points per minute. 3 minute minimum.
Earn Gold without overfilling. 2 min minimum.
Earn triple a gold medal requirement. 2 min minimum.