Here is the full list of all 24 Riptide GP: Renegade achievements.
Continuously boost for 30 seconds on any level.
Break all the fountains in Fountain Park.
Jump through all the radar dishes in Unicorn Base.
Perform the Logroll stunt off a log jump in Firewater.
Find nine Easter Eggs.
Earn 1st place in all Career events.
Earn 2nd place or better in all Career events.
Find one Easter Egg.
Beat Lt. Pane in the second Vyper sidequest.
Own 9 hydrojets in Career.
Beat Krex in the final showdown in Career.
Beat Weaver in the second 0xDEADBEEF sidequest.
Reach level 20 in Career.
Perform a level 10 stunt off a wave in The Ruins.
Reach level 15 in Career.
Own 4 hydrojets in Career.
Earn 1st place in any Career Championship event.
Reach level 10 in Career.
Earn 1st place in any Freestyle event.
Upgrade any hydrojet to its max.
Reach level 5 in Career.
Earn 1st place in any Elimination event.
Earn 1st place in any Slalom event.
Earn 1st place in any Race event.