Here is the full list of all 15 Hexagon Knockout achievements.
Play during Hexagon Knockout's anniversary week
You've seen a lot of rockets passing by!
Play 10 rounds of Classic
Play 10 rounds of Fast Shoot
Play 10 rounds of Huge Cars
Play 10 rounds of Donut
Play 10 rounds of Tokyo Drift
Play 10 rounds of Gotta Go Fast
Play 10 rounds of Bumpers
Play 10 rounds of Sniper
Play 10 rounds of Kamikaze
Play 10 rounds of Keep The Crown
Play 10 rounds of Tic Tac Boom
Play 10 rounds of Rocket Rain
Finish your first game