Stunt Kite Party

Unfortunately, I've tried and it doesn't work with 4 Controllers.

What I did was going to Custom Tournament > 1P > Add 3 CPU (Press)

Then simply add every single game modes into the tournament (1 of each for a total of 10)

It will go as Follows :

-Tail Snatch
-Catchin' Kites
-Alien Attack
-Ghost Hunt
-Meteor Blast
-Vortex Shootout
-TNT Tag
-Rocket Rage
-Bumblebee Banquet
-Balloon Popper

Try to win them all, if you don't, just mark the ones you will need to re-do.
You can do a tournament of the same game mode if you only need 1 (My last one was Ghost Hunt, so I did a tournament of 3 Ghost Hunt until the achievement unlock)

The Robot character should unlock too with the achievement.