Interior Decorator

Since April 2016 (Update 10.92), this achievement is obtained by making 1000 purchases of Furniture Kits. Note that you’ll have to make 1000 individual furniture kit purchases — making 10 purchases of 100 furniture kits each, for example, would only count as 10 purchases. Hint: The cheapest way to do this is to buy 1000 Troughs (7 gp each).
Before April 2016, you had to use 1000 Furniture Packages to obtain this achievement.