Here is the full list of all 21 Steel Racer achievements.
Win a race.
Win 10 races.
Win 20 races.
Win 30 races.
Win 40 Races.
Win all 50 races.
Win the season 1 last race.
Win the season 2 last race.
Win the season 3 last race.
Win the season 4 last race.
Win the season 5 last race.
Finish 1 race.
Finish 10 races.
Finish 20 races.
Finish 30 races.
Finish 40 races.
Finish all 50 races.
Get 50 cash.
Get 100 cash.
Get 450 cash.
Get 700 cash.