DRAGON BALL: THE BREAKERS

You'll need roughly around 40,000 skill points (Flame symbol) to max out at lvl 20 (I did Wall Kick, others could be cheaper not sure)

If you receive all Platinum medals at the end of a match it will grant you 225 skill points. If you get bronze-gold you net anywhere between 80-150 Skill points.

The fastest way to gain skill points is to save up Zeni/ tickets and pull from the Spirit Siphon (machine beside Trunks in lobby) Each duplicate pull will give you 900 Skill points.

You can do one pull with a single ticket or 15K Zeni also you can save up and do 10 pulls at a time with 10 tickets or 150K Zeni.

This achievement is extremely buggy like many others in the game that require you to do the same requirements several times, I've upgraded a skill to +20 twice without unlocking the achievement, the third time I discovered that when you upgrade a skill at +20 if you don't exit the shop by pressing B and close the game and reopen it your points will be there as if you hadn't spent them because if you don't exit the shop the game won't save. So I did this operation several times, always ulgrading a different skill to the maximum, active or passive but nothing, I also tried doing the cloud, deleting the profile and resetting the factory data from the console but still nothing. The solution was to do it on another console, doing so as soon as I entered the shop and upgraded a skill to +20 it immediately gave me the achievement and also kept all the skill points because I closed the game afterwards. This solution of switching consoles also worked for the achievements of playing 50 games with the survivor and 50 games with the raider both of which had a buggy tracker and switching consoles it works, you don't have to play on the other console after this operation, it's just for the tracker to resume. I hope this solution can help many people like me who have had problems, this game is the most buggy I've ever made.