This may still take a few tries, but you'll get it eventually. I recommend instead waiting at the opposite side of his hand each time and at the last moment begin parrying the cards. Ther's also a safe spot behind his hands but this may be hard to consistently enter without getting hit.

I ran an invincibility super just to cheese one of the card rotations. The charge shot is the strongest i believe so that may be the best to use. On normal difficulty I don't believe it is necessary as the pink cards seem to be spaced out well enough, but just in case this helps you then the option is there. You can parry the same card twice if the next pink card is out of parry range. I went from stage 3, to 5, to safe, to 8, to safe, to finish each time as I found that path the easiest. Just choose whatever you're comfortable with. If youre uncertain which one youre looking for, just flip a coin. Once you get the timing down you will get it every time. 'King Dice' may be referring to two or more different villains. You usually want to do this milliseconds before the number comes up. When the number comes double tap to jump and parry almost immediately. In order to get a certain number, single it out in the rotation on the dice and get the rhythm in your head. There are some tricks that aren't so obvious at first that help. This achievement is actually pretty easy. The first 2 tips will still help with getting the level done easier! EDIT: Turns out you just need to have 3 health or higher when you finish, so try to get those hearts in the board game! You CAN get hit during the fight, just don’t go below 3 health.

King dice cuphead bosses