I added this mod to an existing save and noticed that I didn't have any titles for achievements I had already done (make iron tools, tame an animal, etc.). Would it be possible to add those titles retroactively somehow?

This is a fantastic mod by the way, perfect for a medieval fantasy modpack!

Thanks! I'll look into it.

For the moment, you can use the "/titles add " command to give you titles for the advancements you have.