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