This is the passive method, which you can do while messing around on the computer or whatever.
Go to Multiplayer and pick Local Game. Set it to Head-to-Head, Time Wars, 5 minutes and any restaurant.
Seat your first guest at any table, preferrably a large one (regardless how large the group you're seating is), to color the seats. Put your controller down and wait about 04:50, ignoring the fact that the customers get angry and you end up at 0 points.
Right before the match ends, find a group with at least 1 color that matches what you seated earlier and seat the right person in that chair for points. Match won. Repeat 9 more times for achievement.