I feel like I've made every furniture item at least twice now, but it won't trigger the domestic completist badge! Is this a bug or am I missing something obvious? Is there a way to check? What were the original soul-bound furniture items?
The soulbound items were - SDB, Small Cabinet, Ceiling Lamp, Chair, Floor Lamp, Room Decoration, Shelf, Table, Tabletop Decoration, Wall Decoration, Wall Segment.
I had the list handy as I had the same problem till I re-made the Soulbound ones, and also had a list of all other furniture items to tick off as I made them.
Aha, got it! Thanks for the advice, everyone. It really helped. Apparently my stumbling block was the door. All those other doors I made before they added the achievement weren't good enough, apparently.