This achievement is obtained by hitting 200% in Ulala's Dance mode, and is nowhere near as tricky as its TA ratio may suggest. If you have any kind of rhythm or musicality, you'll find it a doddle.
A couple of points that may help:
- As suggested in-game, you can change the controls so that all actions are performed by one button (although this can work against you if you find yourself following the directions)
- One part which may throw you at first is during the Groovemaster 2000 section, around 34% (and again at 134%) of the way in, when the "Meow" command is introduced.
There's a point where the commands go for 2 bars, then 3 bars, then 4, which is counter-intuitive against the music. All you can do is keep an ear out for it, and be aware that it's musically "wrong":
Up, Up, Down, Down / Meow Meow Meow / (2 Bars, feels natural)
Up, Up, Down, Down / Meow Meow Meow / Meow Meow Meow / (3 Bars, feels unnatural)
Up, Up, Down, Down / Meow Meow Meow / Meow Meow Meow / Meow Meow Meow / (4 Bars, back to normal)
Fortunately there are no other weird sequences like that in this mode.
- The sample of the word "Toyota" that Ulala says is too long / out of time against some of the faster tempo sections, which can be distracting. When it comes up, focus on hitting the buttons in time and visualise it as "Chota", which is how it sounds when the other characters say it.
Once you've hit 100% clear the sequence will loop back to the start and repeat, and from 100% onwards you'll be competing against Rhythm Rogue characters. There are a handful of minor differences the second time round, but nothing that you'll have any problem with if you've already been able to hit 100%.
The achievement pops once you have returned to the main menu.