DJMAX RESPECT V

This, plus the achievement for clearing "The Others" (the 1st LINK DISC mission), are the hardest achievements in the game (so far).

In order to access LINK DISC, you must first buy the Clazziquai Edition, Black Square and Technika DLC packs, then you'll need to clear all of their 36 missions. While it's certainly not the only mission to be worried about, just like with 'Rolling on the Screen' this achievement's biggest hurdle is the Technika mission 2-6 'Conqueror', requiring you to clear 3 songs with less than 20 breaks, 2 of which are 8B SC and 8B MX patterns.
Another mission that might be an issue would be Black Square's mission 2-6 'Illusion', an A.I mission harder than the one in the base game mostly due to the randomized 6B SC pattern of ANALYS.
There's not too much advice to give here since these 36 missions range across all button modes and practically all difficulties. You'll need to be good enough to get ~99% rate on almost every pattern in the game to get these done, and you'll need to be decent at other modes you can't practice in Freestyle like 4BFX and Technika's TB mode. SC patterns show up quite frequently so I'm not sure if it's even possible to accomplish this using just a controller instead of a keyboard, but regardless I would recommend leaving this to be the last thing you go for in this game, after you've become plenty comfortable with playing extremely difficult 8B patterns.