Here is the full list of all 15 High On Racing achievements.
You finished Level 15
You finished Level 14
You finished Level 13
You finished Level 12
You finished Level 11
You finished Level 10
You finished Level 9
You finished Level 8
You finished Level 7
You finished Level 6
You finished Level 5
You finished Level 4
You finished Level 3
You finished Level 2
You finished Level 1