Here is the full list of all 14 Roadclub: League Racing achievements.
Save enough cash
Consistently dominate the club
Don't leave a scratch
Fully upgrade a car in career
Get promoted
Max upgrade power of a car in career
Win a race against 5 opponents
Don't bump any opponents for a whole race
Your career begins
Go really fast
Become the next Roadclub Master
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