Full list of all 45 Need for Speed achievements worth 2,200 gamerscore. It takes around 20-25 hours to unlock all of the achievements in the base game.
The base game contains 30 achievements worth 1,000 Gamerscore, and there are 5 DLC packs containing 15 achievements worth 1,200 Gamerscore.
You tuned a car to max drift or grip settings
You equipped top end performance parts to all categories on a car
You've reached REP Level 50
You've become the Ultimate Icon
You've become an Outlaw Icon
You've uncovered the truth about the Outlaw
You've become a Speed Icon
You have beaten the Outlaw's "2 roadblocks in a pursuit" challenge
You've beaten Magnus' personal challenge
You've become a Build Icon
You've met the legendary builder Nakai-San
You filled all the spots in your garage
You've reached the top with your crew
You maxed out all 5 scoring styles in a single moment
You've become a Style Icon
You got called out by other racers 50 times for your skills
You've completed a single-take of Ken's Gymkhana
You've climbed aboard the drift train!
You've reached REP Level 25
You've taken your first snapshot
You've beaten Magnus' record time
You've found yourself a crew
You've learned to drive with style
You competed against Amy's high horsepower contacts
You've won an event with a tuned car
You purchased another car for your garage
You've reached REP Level 10
You won three events in a row
Acquired your spot in the garage
Complete 15 daily challenges
You won events driving Ken's and Morohoshi's cars
You put Ken's or Morohoshi's car in your garage
Get a 350000 Drift Score in Mental Block with Ken's car
You won an event in Eddie's Car
You completed Eddie's Challenge
Reach REP Level 70
You've Taken a Snapshot with a Filter in Snapshot Pro Mode
You Shared a Wrap with the Need for Speed™ Community
Reach Monthly Rank 10 by Completing Daily Challenges
You won five Drag Race events
You downloaded a shared wrap
You bought your first Hot Rod
Win all the Prestige events
Win Gold on all Prestige events
Win all the events in a Speedlist