There is one (sort of)! It's the 100 recipe badge, but at the moment it's unobtainable because there are only 99 recipes in the game. So we're just waiting for Komodo to add the 100th recipe. XD

That's a good question! Considering that recipes have their own dex, and a new recipe is added every time there's a new evolution or variant, it would make sense to have a "full recipe book" badge. I guess I'm wondering if it would be redundant, though, because of the fact that new evolutions and new recipes always coincide with each other. For example, let's say this badge was implemented, and a new evolution and recipe were released tomorrow. That would mean I'd get two simultaneous notifications about depleted badges, which could be irritating to some people. Or maybe it would make the challenge of regaining both more fun? Who knows! I don't have a strong opinion about it either way. But I do agree that it could motivate people to collect all the recipes.

Oh yo this is something I thought'd be cool too, I'm all for more badges to collect