You need to order your house from your telephone. Do not use the sign for the achievement. I had always bought from the sign. Last night I finally got around to using the telephone to buy a home and got the achievement.
Not sure if
THIS still works, but if you purchase the 80k apartment through your phone, then immediately shut your console off VIA the power button, the achievement will pop before you shut down, the crucial part is to shut down before a cloud save takes place. Then
when you turn your console back on and load the game, you will have your expensive apartment and your money along with the chieveo. Just make sure to get a cloud save after that.