Here is the full list of all 43 Little Racers STREET achievements.
Have all available cars in your garage
Beat developers best time on event D-28 - 42.652
Win 200 races in career mode
Purchase your first Class A car
Finish 200 races in career mode
Win a race with a heavily damaged car
Have 20 cars in your garage
Get to 1st place in the ranking
Pay 2 million credits in repairs
Win 100 races in career mode
Improve your ranking to place 10
Win a race in unfair difficulty level
Purchase your first Class B car
Win 10 rain events
Win a class A or B race without suffering serious damage
Improve your ranking to place 50
Drive a total of 500 Kilometers
Finish 100 races in career mode
Complete 20 challenges
Improve your ranking to place 100
Win 10 snow events
Win 50 races in career mode
Earn your first million credits
Improve your ranking to place 200
Finish 50 races in career mode
Purchase your first Class C car
Win an online race
Win 20 races in career mode
Finish an online race
Finish 10 online races
Purchase your first Class D car
Finish a race in last place starting in the first place of the grid
Win a race starting in the last place of the grid
Finish 20 races in career mode
Customize a car in career mode
Tune a car to the maximum level
Win a race with an underpowered car
Finish your first race in career mode
Purchase your first Class E car
Beat developers best time on event A-72 - 47.397
Beat developers best time on event B-64 - 37.768
Beat developers best time on event C-68 - 42.701
Beat developers best time on event E-28 - 22.134