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