Full list of all 95 Forza Motorsport 6 achievements worth 1,500 gamerscore. It takes around 150-200 hours to unlock all of the achievements in the base game.
The base game contains 56 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 39 achievements worth 500 Gamerscore.
Drive for 1000 miles in Multiplayer
Start last and finish first in a Multiplayer Race with 24 cars
Complete 300 Laps in Multiplayer
Complete a Race with every car from Ferrari
Complete 50 laps at Night in Multiplayer
Complete 50 laps in the Rain in Multiplayer
Complete a Race on Every Location (Environment) in Multiplayer
Complete 100 Laps in Multiplayer
Finish first in a 24 car race using the Manual Transmission Dare Mod
Earn 50,000 Credits from Drivatars
Win a race with No Assists turned on in Multiplayer
Equip a Platinum level Badge
Complete the final race of final series in the final Volume
Complete All Series
Complete All Volumes
Vote for a track in Multiplayer
Own the Cover Car [Ford GT]
Finish first in a League Race
Enter your first League Event
Finish first in a 24 car race using the Back of the Pack Dare Mod
Collect 50 unique Mods
Do 25 prize spins
Complete 60 Race Objectives
Use a Track Specialist Crew Mod on the corresponding Track
Finish first in a 24 car race using the Suggested Line Off, Cockpit Camera only Dare Mod.
Earn 100% credit bonus from Mods in a single race
Finish first with all Mod Types equipped
Complete 30 Race Objectives
Finish First in the Formula Ford Factory Spec Showcase Event
Complete a race in the 2015 Chevrolet #9 Target Chip Ganassi Racing IndyCar on Indianapolis
Complete a race in the 2015 Ford #17 XBox Racing Ford Falcon FG X on Bathurst
Equip a Silver level Badge
Complete a race in the 2015 Lotus E23 on Spa in the Rain
Lead for 100 Miles
Earn 50,000 credits from the community using your Design
Earn 50,000 credits from the community using your Tune
Finish First in the Ferrari LaFerrari Passing Challenge Showcase Event
Complete the One Down, First Time, and Street Legal Achievements
Win a Race in a 2017 Ford GT in Free Play with 24 cars
Win a Race in a 2014 BAC Mono in Free Play with 24 cars
Lead for a total of 50 Miles
Win a Race in a 1966 Mclaren M2B in Free Play with 24 cars
Finish First in the Ariel Atom Stig 1-1 Showcase Events
Share a Replay
Visit Forza HUB from FM6
Equip a Bronze Level Badge
Equip a Gold level Badge
Share a Paint
Share a Tune
Go Faster than 250 mph in any car
Share a Photo
Test Drive a car
Beat 10 Rivals while running no Assists
Complete the first race
Complete all Car Divisions, all Series, and all Showcases
Complete All Showcase Events
Finish "The Future" Era
Finish "Motorsport Next" Series
Finish "Supercar Synthesis" Series
Fully explore the Porsche 919 in Forzavista
Set a lap time under 1:30 at VIR Full
Equip a Porsche Badge
Finish "Growing Excellence" Series
Complete 40 laps on VIR in Multiplayer
Race a mid-engine Porsche in Multiplayer or Free Play 10 times
Race the Cayennne or Macan in Multiplayer or Free Play 10 times
Race a front-engine Porsche in Multiplayer or Free Play 10 times
Play VIR in Multiplayer
Finish "The Evolution" Era
Finish "Racing Dominance" Series
Finish "Building Innovation" Series
Finish "The Origin" Era
Finish the Porsche Anthology Initial Experience Race
Complete all Porsche Showcases
Complete 1 Porsche Showcase
Complete the full NASCAR World Tour
Finish The Road to Le Mans Expedition
Drive 50 miles in Joe Gibbs Racing NASCAR models
Finish the One Lap of America Expedition
Race in a NASCAR multiplayer league
Finish the Passport to the World Expedition
Drive 50 miles in Stewart-Haas Racing NASCAR models
Complete all 10 NASCAR Showcase events
Drive 50 miles in Team Penske NASCAR models
Complete a lap of Homestead in under 30.5 seconds
Complete 1 NASCAR Showcase Event
Drive 50 miles in Chip Ganassi Racing NASCAR models
Finish the NASCAR Icons Tour Expedition
Drive 50 miles in Hendrick Motorsports NASCAR models
Finish your first NASCAR race
Race in a NASCAR multiplayer hopper
Equip a Platinum NASCAR badge
Get 100 Perfect Draft Scores
Complete 5 QuickStop races
Complete 5 rolling start races