Make You Sweat

I have made a weak aura helper that makes it easier to do this, especialy if you are planing to fast spam it just for achievement.
https://wago.io/luxBzCtoV

While the oponent is performing his dance moves, click the icons you see on the center of the screen.
When its your turn to perform. spam the center button that appears and that will execute the sequence you inputed.

edit:
Weak aura updated for Dragonflight ui changes.

This Video shows you how to do All Darkmoon Faire Dance Achievements
https://youtu.be/VXg8ypomfIs

First, you have to Import The Below WeakAura (DMF Dance Helper LEO)
https://wago.io/-4DuDZzS3

And Do the Dance Game EASY! 😊

Reward: [item=187689] (Toy)

Achievements List:
First Dance
Don't Stop Dancing
You Got the Beat
Feeling It
What a Feeling
Can't Stop the Feeling
Make You Sweat
Maniac on the Dance Floor
Dancing Machine

Although it looks like there's a Global Cooldown on the dance move buttons, one can simply input the key sequence disregarding that visual representation of a GCD and it'll still qualify as correct -- this minigame - as is at this point - isn't about matching timing but purely about entering the identical order of dance moves. Also, once the bout is won, one can press the 'Leave Game' action button to quickly end the scenario (rather than sitting through the crowd's applaud bit each time!)