Here is the full list of all 13 Car Tehc achievements.
Earn your first money.
Buy every garage upgrade
Paint a Car Blue
Make 500 horsepower car
Buy a shelf.
Steal a part and cancel the job
Complete 20 jobs
Remove all the parts of a car and try to drive it
Sell $2500 worth of items
Max out every part of the car and do a dyno test
Don't give a name to your garage
Order 10 funnels at the same time
Delete 20 e-mails