This race will be under boulder desert. Wont open till after rank three for me as a racer. An you can choose the camro. Just make sure the color Bee yellow that you choose which will be the second color from the left its not the yellow looks more orange an you have the achievement. An you dont have to be in first to win it u can be in 2nd or third... The achievements popped after you collect the bounty points and head back to the map.
Also Note "Actually the race is not unlocked depending on your level, its unlocked by finishing other races and progressing in the game so this race should unlock about 15-20 minutes into the game if your just playing the races."