Did a search and saw nothing for a chocolate-based achievement, so thought I would suggest one. :)
"Chocoholic" Feed a pet the following items:
Edit: Add the chocolate hearts and give a forum title? :)
Title: Chocoholic.
(aka: throw ideas at me!)
Why those items? I just thought of them as a set, and ran with it. :) Could be ANY other chocolates on the site.

Ohh that is cute. I like it!

With forum title, please! Because I have a great need for forum titles.
;- ; I'm so glad that this seems to be well accepted. <3
And, I do like the idea of getting a title with it, but it feels too easy for that. (Though, if they want to attach one with it, I'm ALL FOR IT!!)

Ooo I love it :D Maybe add more? Like the Chocolate Hearts?
I feel like adding the hearts in would make it more worthy of a title, for sure! :D

I really love this idea, especially since it focuses on items that are restockable, rather than retired from event items :D
Yeah... I would rather see more stuff that can be obtained by even newcomers without driving prices up TOO high.

A pet who is truly chocoholic would have eaten a lot more chocolate items than this IMO. Maybe have a counter of any items in Foods Eaten with the string "choco" in their name, and any pet that's eaten more than tiers ten/fifty/two hundred fifty (whatever the items may be)?
I do like that, as well, but wasn't sure how easy that would be to implement. In any case, I would LOVE to see something done with Chocolate and achievements.

Some other "sets"
Chocolate Balls ;)
Chocolate Pets * * * *idk technically Cadogite, Velvet and Waraling aren't official pets
Gross Chocolate Sticks*
Coated Fooods
Those chocolate sticks just make me want to hurl. LOL

I like the idea of the chocolate pets and chocolate balls being part of it. If the achievement were to have a title, it can't be too easy to get so more chocolate would good :D Oh god not the poop sticks please no lmao
Now now, we mustn't squeam at the ...culture?... ...cuisine?... our unliving fellow users. It's really our pets that are eating this food, and I have owned a dog that ate poop with relish when he could get it.
A true chocoholic would at a matter of gustatory pride try the gross sticks at least once. I know chocolate fiends in real life that have eaten chocolate covered ants and -covered fried grubs.