Full list of all 12 Forza Street achievements worth 1,000 gamerscore. It takes around 150-200 hours to unlock all of the achievements on Windows.
Beat Episode 3
Reach collection level 20
Drive a total of 500 miles
Beat Episode 2
Log into the game on 7 consecutive days
Beat Episode 1
Log into the game on a different day
Dominate an Event for the First Time
Collect 15 cars
Reach collection level 5
Obtain your first 2 Star Car
Obtain your first 3 Star Car