Are there any [stand-alone] mods that add in-game achievements to the default roster, thus increasing the game's longevity? Even if they are relatively uncreative and not related to Steam achievements. For example: [Posted Here] Thank you!
That's an excellent idea! Perhaps you should add it to this list(it's pinned in the discord modders' channel for when folks need new ideas): https://github.com/StardewModders/Modding-Ideas/issues