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