Blizzard published a blue post to let players know that they are looking into issues with Support Your Local Artisans and Love Language Expert having their criteria reset.
These issues are probably linked to a recent hotfix pushed to live servers that changed both achievements to have account-wide credit. These updates likely caused some unintended side-effects.
Thank you for your reports. We’re aware of the issues with the Support Your Local Artisans and Love Language Expert achievements and we are currently looking into it.