Full list of all 12 Jet Car Stunts achievements worth 400 gamerscore. It takes around 5-6 hours to unlock all of the achievements on Xbox 360.
Get bronze or better medal.
Get silver or better medal.
Get a gold medal.
Beat your own ghost in the Time trial level where you already have a gold medal.
Complete Platforming Hard A in less than 0:50:00 with no retries.
Beat the time 1:48:00 in Time trial Easy A.
Beat the time 2:26:00 in Time trial Medium C.
Beat the time 4:25:00 in Time trial Hard B.
Complete all Time trial levels.
Complete all Platforming levels.
Complete all Collector levels.
Complete Platforming Very hard A without any retries.