Pretty easy - just download and install the Mafia Wars Toolbar. You can always uninstall it later if you don't want it - you will still keep the achievement.
Additionally, the gift safe house has been re-opened. I'm not sure if this is a bug or if this is the developers stalling for time to finish Bangkok by the end of the month, but I would jump on it quick! There's 10 slots available in the gift house and you can open a gift (even if no one sent you one) for 2 godfather points.
