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