Full list of all 46 Forza Horizon 2 achievements worth 1,000 gamerscore. It takes around 60-80 hours to unlock all of the achievements on Xbox 360.
Your garage contains 50 cars
You mastered all of the Events at 3 Destinations
You earned the Bronze Wristband
You mastered all of the Events at 1 Destination
You completed 10 Bucket List Stunts
20 different Speed Cameras caught you doing over 100mph
You beat them all to become Horizon Champion
You completed all 3 Road Trips
You earned the Purple Wristband
You found and smashed every Reward Board
You mastered your first Championship Event
You made it to Montellino
You beat the train in a Horizon Showcase Event
You made it to Saint Martin
You completed the Amateur Road Trip
You earned 10 Skill Points
You made it to Nice Massena
Nice driving. You earned the Clean Racer Skill 100 times
You earned your first sponsorship bonus
You bought your first car
You smashed 25 Reward Boards
You made it to Sisteron
You restored 5 Barn Finds
You earned the Blue Wristband
You made it to San Giovanni
You made it to Castelletto
You won your first race
You earned the Yellow Wristband
You arrive at the Horizon Festival in style
Master all of the Events at every Destination
Obtain the Gold Wristband
Have 20 million credits worth of cars in your Garage
Earn 109 Skill Points
Collect 3 Bounties
Complete all Bucket List Stunts
Earn a total of 1,000,000 Cr from Rivals
Join a Car Club
Drive down every road in the game
Compete in 20 Multiplayer Events
Compete in 200 Multiplayer Events
Complete an Online Road Trip Location
Complete 25 Online Road Trip Locations
Complete 25 Bucket List Stunts co-operatively
Join an Online Freeroam session with at least one friend
Complete 100 Playground Games
Earn every Sponsorship Bonus