Here is the full list of all 42 Gear.Club Unlimited 2 - there are Ultimate Edition achievements.
Own 30 cars
Finish a race on less than 2% fuel
Buy Gustav Reuter's “Koenigsegg Agera RS Custom”
Beat Gustav Reuter
Beat Primo Biondi
Visit another player's Performance Shop
Own 15 cars
Buy a category D car
Install 10 items in your Performance Shop
Beat Teruko Nakamura
Win Vassily Rykov's car
Add a body part to one of your cars at least once
Change the rims of one of your cars at least once
Put 5 stickers on the same car
Change the look of your Performance Shop
Win Payton Hills' car
Buy a category C car
Own 5 cars
Beat Vassily Rykov
Earn your first Million Credits
Buy a category B car
Drop out of a race
Beat Payton Hills
Build the Wind Tunnel
Complete 25 solo races
Build the Body Workshop
Join or create a Club
Change the color of one of your cars at least once
Put back a part of lesser quality
Install 5 parts on your car
Build the Tire Workshop
Buy a category A car
Beat Ken Cole
Build the Mechanic Workshop
Win Teruko Nakamura's car
Win Primo Biondi's car
Complete 25 races with no collisions
Win the Porsche 911 Type 930
Win the Ford GT40
Win an Endurance Championship
Complete an endurance race without changing your tires
Reach 400 km/h on the Le Mans circuit