Just finished my first playthrough.

I completed the game today. I did not do everything, for example i did not beat final boss of Grimm dlc, but i did a lot imo - or so i thought, as i recently discovered that you need 112% to complete the game - and i have 99%. So i'm curious about what i miss, besides two mask fragments, trial of fools and a spell upgrade (vertical splash one), which i do not happen to know the localisation btw.

And are there multiple endings ?

Where do i have to search to "complete" Hollow Knight ?