After the opening sequence of cutscenes, you'll be given access to the main character. Walk through the few small areas, past where you first see Jack, all the way until you drop down the small ledge to reach a bonfire. Look on the right side of the bonfire to find a brown purse that you can interact with by pressing
. Turn the purse over to look into it and press
again to pull out Mia's Driver's License. The achievement should pop here, but some people have had better luck by actually examining the found item. Open up your inventory by pressing
and choose the Driver's License, then choose the magnifying glass icon to further examine the item. If the achievement didn't pop before, it should pop now.
-AchieveDad