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Is the problem that you don't have the Turd Vessel unlocked and can't/haven't completed the purchases?
Or is the problem that the game isn't syncing to give you the achievement?
If it's that Steam isn't syncing; I would recommend saving data to cloud, uninstalling the game and re-installing, then starting it back up again to see if it syncs.
The only other possible conflict I could imagine would be mods that are affecting the game; if you are using any mods I would recommend saving your files, removing the mods, starting the game to see the progress & possible achievement unlock and then re-adding the mods.
I hope this is of some sort of help but let me know how it goes for you and I'll see what more I can do! <3