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.
Complete 100 dismounts with the Pink Lightning.
Totally demolish all vehicles (that can be demolished).
Nail it 100 times.
Try everything once.
Cross the finish line on Skid Marks at 88mph.
Cut down 100 trees.
Do ten strikes with the Bowling Pins.
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.
Fully obliterate Mr. Dismount.
Launch three consecutive dismounts at max velocity.
Detonate ten mines in a single dismount on Run DMZ.
Customize Mr. Dismount or a vehicle.
Play a Steam Workshop level.
Totally demolish a single vehicle.
Lose only a single limb during a single dismount.
Reach a record time on Skid Marks.
View a replay in slow motion.