This is a real time achievement. You have to clear a house in The Slums with 100% loot collected on Christmas Eve (24th December).
You can wait until the 24th or go offline with your xbox (System->Network->Go Offline, forget all networks, Hard reset the console then go System->System and change the date). You won't get a notification for the achievement if done offline but once connected, load the game and it should appear.
Note, you will need at least Hacking Lv1 to complete this achievement in game. This can be done at any point in the game as The Slums is always open but will be easiest at the start of a fresh save.
Edit: Hacking Lv1 not needed. Thanks for those in the comments point this out!
13/03/17: It's looking like this method has been patched out. You'll now have to wait until Christmas Eve to pop it by completing a Slums level with 100% loot.