This achievement is pretty self explanatory.
you need to play through a game show with 3 other human players.
SO FOUR HUMAN CONTROLLED PLAYERS IN TOTAL!
you can use one controller
so dont be put off buying this game because you do not have four controllers
you can do this by playing the shorter 3 round show also to save time.
by doing this you could also go for the grab bag achievement where you need to guess all 8 answers in a grab bag round
just choose 4 people to control and make sure you answer the question wrong or let the timer run out with the other characters so that you're left to answer the right ones
YOU need to answer all 8 if any of the AI do the achievement becomes void for that round.