The easiest way to do this is in a single player game when starting a new career.
Select 'Single Player' then 'Career'. The first event you can do will be 2 laps of 3 very easy tracks. Select the vehicle you want from the vehicle choice (or spend a bit of Kudos to choose something better but what's on offer for free is more than good enough) Difficulty doesn't matter to the achievement or your score/Kudos. You'll be racing against 3 AI opponents which are easily beaten even if you've chosen hardcore difficulty.
You must finish 1st in all three races to get this achievement.