Here is the full list of all 14 Roadclub: League Racing achievements.
Go really fast
Win a race against 5 opponents
Your career begins
Don't leave a scratch
Get promoted
Consistently dominate the club
Become the next Roadclub Master
Max upgrade power of a car in career
Fully upgrade a car in career
Save enough cash
Win a league race with an RWD car
Lose first place and win a race coming back from last place
Eliminate an opponent and win any race
Don't bump any opponents for a whole race