I just managed to carve the 500 pumpkins needed for this achievement, but when I tried to check what the prize for this achievement might be, nothing happened. I know there's a possibility that this is one of the unofficially retired achivements (either that or it's a glitch) but would someone mind telling me what the prize/title should be?

I think it's been like that for a while, but the reward should be the hidden Morostide Site Theme.

Thanks, ! I now have a delightfully eerie new site theme.

No problem! Congrats on the achievement and theme :)