While you’re exploring the city of Novalis, you may have encountered some pickups, indicated by a white icon on the mini map. While these are mainly punch cards, every now and then, you’ll pick up other objects, including ancient computer games.
Danya is outside of the coffee shop you’ll go to early on in the story, she’ll ask you to find any ancient games and she’ll buy them. If you’ve been exploring the city, chances are you may already have one. She’ll buy it off you, you’ll get some decent money and the achievement will unlock