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