At the Hive the Bartender will want you to take care of a girl that hasn't payed her tab.
Make your way to her apartment by following the blue quest marker.
Here you'll meet Java, but before you try to threaten her listen to what she has to say. Offer to help and return back to the the Hive. At this point you're not gonna get the achievement until you cough over 5000 credits to settle out between the two. But at the same time you'll also be getting two achievements.
Guardian Angel 10G
Bar Tab 10G
Hope this helps :)