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