Here is the full list of all 20 Jet Car Stunts achievements worth 200 gamerscore.
Complete all the levels in "Free - Time Trial" with at least a gold medal.
Complete all the levels in "Original - Time Trial - Intermediate" with at least a silver medal.
Completed all the levels in "Original - Time Trial - Easy" with at least a bronze medal.
Completed all the levels in "Freestyle - Intermediate" with at least a silver medal.
Complete all the levels in "Freestyle - Easy" with at least a bronze medal.
Complete all the levels in "Bonus - Easy" with at least a bronze medal.
Completed all the levels in "Original - Platforming - Hard" with at least a silver medal.
Complete all the levels in "Original - Platforming - Easy" with at least a bronze medal.
Spin the car 720 degrees or more whilst in mid air.
In mid air flight, back flip car two times or more.
Successfully land the car after a massive jump.
You double barrel rolled the car!
Complete all the levels in "Free - Platforming" with at least a gold medal.
Drive the car at super high speeds.
You have completed all the tutorials.
Completed all the levels in "Original - Platforming - Impossible" with at least a gold medal.
Complete all the levels in "Original - Time Trial - Hard" with at least a gold medal.
Complete all the levels in "Bonus - Hard" with at least a silver medal.
Complete all the levels in "Bonus - Impossible" with at least a gold medal.
Complete all the levels in "Freestyle - Hard" with at least a gold medal.