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