Roller Champions

This does not work in custom matches!
I recommend trying this in a quick match after ensuring that your team is leading.

Try doing the highjump between the small inner and outer walls of the arena.
Simply highjump against one wall by pressing and build momentum by rolling down the wall while holding . Keep holding until you reach the other wall.
For your ceiling jump, do the highjump with , move your left stick against the wall and as soon as you touch it do a regular jump with . That should give you enough height to reach the ceiling.

Here's how I did it:

I found other guides/videos I've seen didn't really help me so I decided to do my own, I feel like it is more indepth than others and explains things better.

So I hope it helps you, but just remember it's not easy you still have to go out and do it yourself, otherwise I guess you wouldn't be here if you had, good luck!

What I found from the video guides is that you have two jumps usable on the wall and an jump. So here's how I unlocked the achievement:

In a quick match, I started near the outer wall of one of the ends of the arena, went to the inner wall, did an uppercut with , sped down the wall with , let go at the next wall and hit while going up, then sped down and repeated, always pointing at the wall I was on to stay on that wall. However, this alone only allowed me to almost reach the arena ceiling. So rather than simply tapping and once each in sequence (2 buttons) while going up the wall, I rapid tapped (to do two of the uppercut jumps) and then rapid tapped (normal jump) and found that I had enough height to touch the ceiling and this is what unlocked the achievement for me.