For this achievement you will need to land on every square on the board even though the achievement states "every property"
I found the best way to unlock this achievement was too set up a 4 player human game (As cpu will become a pain) with all players starting with M2000 (initial cash), No propertys at start, Pass go salary on M400, Auctions off (too save time)
With these's rules on. You will just need to keep taking everyones turn, best way to keep track is to buy propertys that you land on (hence why in the rules I listed that if you start with more money you can buy all of these with no trouble what so ever). I can CONFIRM that you DON'T need to land on every property with one player!, I managed to get this done in about 5-10 mins as you will probably or most likely land on a different square with every turn of a player.
Hope this helped! Any questions or comments just leave below.