"Diamonds" on Beginner is the easiest way to get this achievement. There are only four moves: Digital, Pros & Cons, Smash, Wipe It Atcha.
Digital - Not much I can say on this one, use Practice That or restart the run after trying it a few times. Lean with a bend in your knees to the right, curl your right arm up and your left arm down, then reverse that going to the left.
Pros & Cons - Lean into the arm that's going out. I found I maxed out the spotlight if I did the wrist flip as well.
Smash - Aside from timing the smash just right, as soon as you follow through on the smash, let that arm go limp and fall to your side.
Wipe It Atcha - Wipe your forehead, then flick your arm down to your side like you were shaking water off. Also note that it's not a step together, but step then tap behind.
Do it six times, once with each character. If you do it all in one run, you'll also get: