When unlocked, the achievement reads “You successfully performed rhythm tricks throughout an entire song.”
That means that you need to get the maximum number of possible rhythm tricks in the song. The two easiest songs in the game are arguably Every Little Step and YMCA, where you need 199 and 263 rhythm tricks respectively. There are many suggested methods for this, some can be found HERE, but I found the jump rope method and the method in the thread’s video did not work reliably for me. I found the most reliable method to get a rhythm trick was to “strut” or walk like Bernie from Weekend at Bernies. Basically walk in a slightly wide stance and throw one shoulder back on each step. It has the advantage of being low impact on the knees and shins and tracks reliably. You’ll know you are getting a rhythm trick because you will get a small coloured burst (colour varies) around your torso.