Here is the full list of all 14 Audiosurf 2 achievements.
Using a wakeboard mode, catch over 11 seconds of air.
Using a Wakeboard mode, catch over 7 seconds of air with at least a 2.75x trick multiplier.
Create a new skin or mod and share it on Steam Workshop.
Using Audiosprint mode, get a perfect run on a song at least 3 minutes long.
Using Ninja mode, get a perfect run on a song at least 3 minutes long.
Send a song challenge to your friends.
Using Mono mode, earn over 15,000 points in a single grid match.
Get a new mod on Steam Workshop.
Get a new skin on Steam Workshop.
Ride 65 different Songs of the Day.
Ride 7 different Songs of the Day.
Using a puzzle mode, earn over 25,000 points in a single grid match.
Using a puzzle mode, earn over 150,000 points in a single grid match.
Using Mono mode, earn 1 billion points (cumulatively).