Here is the full list of all 18 FutureGrind achievements.
Destroy the P.R.A.X.I.S. system
Earn 30 diamond trophies
Access an unauthorized area of memory
Destroy the Device
Complete an assignment from the hacker
Complete a track in the Luun region
Grind 42,195 meters
Complete a track without spinning. At all. Don't touch the spin input. Seriously.
Score 250,000 points or more on a score attack
Complete a track with the Subverse bike
Complete a track with the Xero bike
Earn 10 diamond trophies
Complete a track without jumping. Good luck.
Complete a track with the Gimbal bike
Complete a track with the Left Coast bike
Spin your bikes for a total of 314,159 degrees
Earn 1 diamond trophy
Complete a track with the Slice bike