@Wonder Sparkle
I can give a few ideas.
My “Not a llama” is from April fools 2017. No idea how I got it but I did.
“Daring Do Dakimakura” from my attending the derpibooru panel at Bronycon 2017.
“Happy Derpy” because site donator.
“Platinum Patreon” as that’s how I support site.
My own custom badge that is given to gold and platinum supporters.
And eventually the 2018 community collab project badge as I’m in the image.
The Site donation badges are the only really easy ones to get. Rest are special or have requirements. Take the Daring Do MLP panel one I have. Only 27 people received it. I almost didn’t as I almost missed the panel.
You could always act like a jackass and get the duck badge…
EDIT: Hover over my custom head badge and see if you recognize the words. A famous series reference I modified for my own use. LOL