Dead Cells

This achievement kinda sucks but this is definitely one of the easiest bosses to get a no hit on.

First off, this boss is found in the "nest". You get there by going through the garden areas.

I used a fast sword and good shield and prioritized brutal skills whenever I got the chance to maximize DPS.

When you get to the boss what I did is hit to make a save. Then learn the bosses moves. This one is very simple because they really only have 3. It's divided up into sections. when the boss shows itself get up real close to it and watch the claws (the reason you want to be close is that the boss doesn't throw the goo grenades when you're close). When the claws turn yellow, the mama is about to strike. Personally I prefer to parry because it's easier than dodging 3 times super quick. The boss will switch sides a few times, just do the same thing as before. The only other move it has is the most annoying move and the only one you may struggle with. it's when it goes underground and jabs at you through the ground. I honestly don't know any strategy for this except dodge like hell. Remember that you can save scum by pressing when the boss is switching sides and there's a breather. If you get hit, just sit there and let the boss kill you and restart. (presuming you have accessibility options, if not you can press home once you die and reload the game).

Good luck and let me know if I missed anything!