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