Here is the full list of all 23 Turbo Dismount achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Perform 1000 decapitations.
Launch 1000 dismounts.
Nail it 100 times.
Pull ten somersaults in a single dismount.
Drive through 1000 turbo pads.
Complete 100 dismounts with the Pink Lightning.
Cross the finish line on Skid Marks at 88mph.
Try everything once.
Totally demolish all vehicles (that can be demolished).
Fully obliterate Mr. Dismount.
Do a successful barrel roll and landing.
View a replay in slow motion.
Get hit by five different NPC vehicles in T-Junction.
Customize Mr. Dismount or a vehicle.
Do ten strikes with the Bowling Pins.
Launch three consecutive dismounts at max velocity.
Cut down 100 trees.
Reach a height of 1000ft (305m) in Space Program.
Play a Steam Workshop level.
Reach a record time on Skid Marks.
Detonate ten mines in a single dismount on Run DMZ.
Totally demolish a single vehicle.
Lose only a single limb during a single dismount.