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