I will show you the locations for all 20 pumpkins for Halloween Update.
I will show the pumpkins in the order I found them following the walkrough guide on Steam. Also know that there are a bunch of other pumpkins which you can't pick up and therefore don't count.
Btw. you have to play the game during halloween period and then the pumpkins will apear. You can just set the date to halloween period on your pc so you don't actually have to play it during that time. I set the date to 27.10.2022 btw.
Every pumpkin except one should be unmissable, which means you can load a save for hour 6 or 7 and then collect all, but that one. So make sure you do not miss that one or you have to load an older save to be able to get it.

Also check out my main achievement guide for the game:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=1993123514