So, some achievements seem to be broken or not work properly. For example, whenever i complete an achievement in where a pet consumes an item (food/books) it would not register unless I go to the achievement webpage, click on the specific achievement, and then reload the website. And because of this, another achievements aren't registering properly, like the Foodie achievement. I just bought a r99 food for my pet, give it to them but it still doesnt register...

you almost always have to reload the site/achievements to get a new item-based achievement to trigger, so that's not a glitch. As for the Foodie achievement, trying going to your pet's foods eaten page, which you can find under the dropdown next to your pet on the Pets page. Good luck! :D

Yes! It was exactly that! Thanks a lot for the advice!! I will make sure to check all the pet pages from now on!!

There are several achievements that need to be triggered in certain ways. This [topic not found] may help in the future!

Some achievements are slow to work/update/trigger (cache issues). These can take several hours to actually activate.

Also there really are some broken achievements (Richest User for example), and some achievements that work fine but the game/activity needed to earn them are broken (bug game comes to mind for this one).

Its often helpful to ask in the Help & questions forum, to see if there's a known workaround, or its a new problem.