You obviously get this by joining a random online game or join a friends game. You have to play until you get to the garage in single player before you can host or join a multiplayer game.
Scroll to "online
" and search for story mode or nightmare mode. It will ask if you want to load your save while you wait. I clicked no and still found a game. The achievement unlocks when you are loading into the game. You can back out right away if you want.
If you have a friend who needs the achievement as well.https://www.trueachievements.com/creategamingsession.aspx?ga...
It helps to be on each others friends list.
Start Dead Rising 3
Invite friend to party
select invite party to the game.
friend should automatically be added to the game.
Repeat steps for yourself, so then you too can be a dick!