Here is the full list of all 19 AudioSurf achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Using Ninja Mono, earn Stealth. 11 min minimum.
Using Ninja Mono, earn Stealth. 7 min minimum.
Dethrone a friend from a global scoreboard.
Beat a friend's score less than 15 min. after they earn it.
Fill all columns within 15 seconds. No greys. No matches.
Finish Clean, Gold before finish, hit last block, elite only.
Score 17000 points in a single match.
Make a candy stripe.
Collect a chain reaction of 7 white blocks.
Collect a match of 24 blocks.
30000 points per minute. 3 minute minimum.
Collect matches in 4 colors simultaneously.
Earn Clean Finish and Gold 3 times in a row.
Stealth and collect every color block. 3 min minimum.
Using Ninja Mono, earn Stealth. 3 min minimum.
Turn 21 blocks red with a single paint.
Earn Gold without overfilling. 2 min minimum.
10000 points per minute. 3 minute minimum.
Earn triple a gold medal requirement. 2 min minimum.