For the achievements like "Master Clothing Furnisher" "Master Blacksmithing Furnisher" etc there currently is (to my knowledge) no reward tied to them such as a dye/color/achievement furniture.
I think it'd be a neat idea to offer replicas of the various gatherable materials and the pre-requisite of these is those achievements. The items themselves can cost something like 500-1000 gold each perhaps and you can buy any of the type you want. So for "Master Clothing Furnisher" for example you'd be able to buy a replica plant of Jute, Flax, Cotton, Spidersilk, Ebonthread, Kreshweed, Ironweed, Silverweed, Void Bloom, Ancestor Silk.
These items wouldn't be harvestable they would just be cosmetic. But it'd be nice if I could make my own garden with the various assortment of plants and herbs that are already in the game in addition to the various woods and herbs that I could use to decorate more. The same goes for Jewelry seams.
Here's some various images to give you an idea of a few items.
Voidbloom
Violet Coprinus
Dwarven Ore
Copper Seam
Nightwood Log