Sorry if someone already mentioned this on this sub or if there is a video out there but I found this through my own experimentation. I don’t claim credit for this method.

Equip the Heart Ring Charm

Do the Djimmi spin trick

Go into the King Dice fight and reload it until you get the very first space on the roulette wheel that will give you an extra HP. Go into that fight.

Get a parry from the olives. You could probably just wait until you get a third parry and the achievement might work. Beat the boss.

(When you go back to King Dice, it will say that you have less health, but just ignore that. Not sure if it’s a glitch or what)

Go the to next space that will give you an extra HP and the achievement should pop up. (ASSUMING YOU DIDN’T GET HIT ONE TIME)