Where exactly are you stuck? Can you show me a screenshot? Thanks.
https://prnt.sc/wnw91m
I think i need to get the double jump before i go here. anyways i restarted the game and finished it
Sure! The very last item is the reward for collecting all the eggs. The one between the garden prop and the skull can be found in the same general area you found them. Once you have it, you can trigger a hidden boss fight nearby, and the last missing item will be the trophy for defeating it. Hope it helps! ;)