Full list of all 58 Forza Motorsport 4 achievements worth 1,250 gamerscore. It takes around 150-200 hours to unlock all of the achievements in the base game.
The base game contains 48 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 10 achievements worth 250 Gamerscore.
Reach 240 mph in any car.
Reach 88 mph in a DeLorean.
Own every Ferrari included on Disc 1.
Own the five most expensive cars in the game (not including DLC).
Beat a Ferrari 330 P4 in any race while driving a Ford GT40 Mark II.
Complete the eighth year of Season Play.
Post a time in every Rivals mode event.
Complete a lap around the TopGear Test Track while driving a KIA cee'd.
Upload a movie to Forzamotorsport.net.
Complete the seventh year of Season Play.
Level 50 in Career
Earn a perfect Drift score.
Level 40 in Career
Take a photo of any car in every Home Space.
Complete the sixth year of Season Play.
Fully explore any car in Autovista.
Level 30 in Career
Complete the fifth year of Season Play.
Race and defeat an opponent in Rivals mode.
Level 20 in Career
Complete the fourth year of Season Play.
Visit the Message Center on at least five unique days.
Earn a perfect Speed score.
Complete the third year of Season Play.
Level 10 in Career
Sell a car tuning, paint job, or vinyl group from your storefront.
Use Kinect to drive any car in Free Play.
Complete the second year of Season Play.
Create a car tuning file for your car.
Share a car in your garage with your Car Club.
Create or join a Car Club.
Earn a perfect Drafting score.
Complete the first year of Season Play.
Knock down a gold bowling pin in Car Bowling.
Create a paint job or vinyl group for your car.
Level 1 in Career
Create a custom playercard with badges and titles.
Earn a perfect Pass score.
Earn a perfect Turn score.
Import a file from Forza Motorsport 3.
Be the winning bidder on any "unicorn" car in the Auction House.
Complete the very first race in the game.
Finish 1st in every single race in the Event List in Career play mode.
Finish a race on every race track in Forza Motorsport 4.
Complete the ninth year of Season Play.
Complete the tenth year of Season Play.
Complete 10 Autocross events without hitting gate cones.
Get any Car Manufacturer to Affinity level 50.
Earn 30,000CR in the 2007 Porsche 911 Turbo (997).
Complete 5 online circuit races in the 1982 Porsche 911 Turbo 3.3.
Earn 30,000CR in the 2008 Porsche #7 Penske Racing RS Spyder Evo.
Complete 3 online circuit races in the 2007 Porsche 911 GT3 RS (997).
Complete 3 online circuit races in the 2010 Porsche Panamera Turbo.
Complete 5 online circuit races in the 2010 Porsche 911 Sport Classic.
Win online in the 2011 Porsche #45 Flying Lizard 911 GT3-RSR (997).
Win online in the 1973 Porsche 911 Carrera RS.
Win online in the 2003 Porsche Carrera GT.
Win online at the Nürburgring Nordschleife Full track in the 2012 Porsche 911 GT2 RS.