Here is the full list of all 16 RUSH achievements.
Earn 500k points across all Score Challenge courses
Grind for 60 seconds
Win Gold in every Race
Win Gold in all Misty Mountains Races
Win Gold in all Sunburst Canyon Races
Win Gold in all Frozen Alps Races
Win Gold in all Verdant Valley Races
Grind for 15 seconds
Get 1st in 5 Races
Beat your ghost in a Time Attack course
Thread the needle
Open two cans at once
Shoot a hoop
Get 1st in any Race
Get 1st in a multiplayer race
Fly through a waterfall