To get this achievement, you must own a house that is worth 35k. You can buy things to increase the value, such as TVs, stuff for the kitchen, you get the point. The easiest way to get this achievement, however, is to go to a new game. Then select Choose Household. Then select any household that is worth 35k or more(I moved in with Alice Rannt). From there, go to build and buy, and purchase and add something to the house. Once you do that, go back to live mode. Achievement should be unlocked after you go back to live mode.