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