Forget what I said, I did it.
I got every achievement in Cuphead! I now have every achievement in the base game and DLC.
It took me over two hours, today, to get the S rank that I needed. My hands were hurting at the end of it.
The insane thing when I got the S rank the achievement didn't pop. So, I had to spend another 30 minutes doing it again. I can't remember an achievement not popping, for me before this. And of all the ones to fail...I could have cried.
Anyway, happy to have finished it and that's me done with Cuphead. Here is the vid of the moment I got it.