Here is the full list of all 21 BlazeRush achievements.
Rise from the last spot 5 seconds before the finish
Break the sound barrier
Destroy 20 cars with a soundwave
Destroy 40 cars with the saw
Overtake the leader a second before the finish
Unlock all cars in career
Do a NO SCOPE, while doing a 360
Defeat the boss
Complete all career missions
Destroy 50 cars with the autogun
Hit yourself with every possible weapon
Kill the opponent with each weapon but the slime
Drop a slime while in the lead
Die a hundred times
Be the king for most of the race
Spend 2 seconds in the air
Destroy 30 cars with the missile
Win in each of the three modes
Be the leader and lose it all 5 seconds before the finish
Complete your first serious competition
Join an online party