Here is the full list of all 20 Jet Car Stunts achievements worth 200 gamerscore.
Completed all the levels in "Original - Platforming - Impossible" with at least a gold medal.
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.
Complete all the levels in "Freestyle - Hard" with at least a gold medal.
Complete all the levels in "Bonus - Easy" with at least a bronze medal.
Completed all the levels in "Original - Time Trial - Easy" with at least a bronze medal.
Drive the car at super high speeds.
Completed all the levels in "Original - Platforming - Hard" with at least a silver medal.
Successfully land the car after a massive jump.
Complete all the levels in "Original - Platforming - 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 "Free - Platforming" with at least a gold medal.
Complete all the levels in "Freestyle - 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.
You double barrel rolled the car!
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 tutorials.