Cobra Kai: The Karate Kid Saga Continues

Karate Challenges are specific goals that, as you complete them, will give you coins towards upgrading your characters. At the end of each level, you'll be taken back to your dojo where you can check on your progress and claim any finished challenges. There are eight other achievements tied to finishing off different categories of these challenges. You will likely get this through normal gameplay without trying, but if you need help, you can check the list of available challenges in your dojo.

Not all challenge categories are available from the start and the game doesn't retroactively reward progress for previously completed feats, so I'd recommend playing through the game normally until all categories are unlocked before really focusing on completing everything.