The DLC has been out less than a week and already someone has managed to complete Richtofen’s side of the High Maintenance Achievement/Easter Egg.
Zombies group NGTZombies posted up a full guide of how to complete all the steps of this Achievement after many, many hours of wondering around the Die Rise map trying to figure it out.
So far only Richtofen’s side of the Achievement has been worked out, however the first three steps are the same as Maxis’ side, so you can at least get that far. You will need four players to complete it. Upon completion you will automatically be awarded with all six perks if you didn’t have them already.