Fighters Uncaged

You get 1 crown for each 100 points you earn above the base "high score" of 6000 for each fighter. Because there are 12 fighters in League 1, you need an average of 12,000 points per each fighter to get this achievement. As everyone knows, the more health and time left you have at the end of each match, the more points you gain. I'm not sure, but I think you get a penalty (subtraction of points) if you lose one round instead of beating the opponent in two rounds.

This achievement is called "King Of The World" and the way you get it is by earning enough crowns to complete League 1 and moving up to Open League. It comes with time. Try to get around 10k to 15k points on each fighter. That should be about enough to reach 720 crowns.