If You Are Using Steam -
You Need 4 People To Start A Game.
(Below Is A Steam Group I Made With A Bunch Of People Who Joined To Get These)
https://steamproxy.net/chat/invite/FQuDq1PD

Change Your Download Region On Steam To The Same One For All Four People.
^ This is Important, It Is How You Will Be Matched Together With The In-Game Matchmaking.
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Troubleshooting The Matchmaking
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The Four Of You Will Now Start Matchmaking At The Same Time, And If Anyone Gets Matched Together (2 Out Of 4 Of You End Up In The Same Lobby), The Other Two Should Keep Leaving And Rejoining The Quene Until They Find That Game.

This May Take Multiple Attempts By Some People To Find The Lobby, Do Not Give Up!
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Once All Four Of You Are In The Same Lobby, The Game Will Start.

(You May Experience Disconnects From Time To Time As Well, Which Will End The Match)

Win Any Event After Matchmaking Has Been Completed.

Keep Track Of Who Wins Each Event.
- At The End Of The Game, During Slicecycles, The Host Must Leave The Game!
(The Host Is The Red Player.)

After Slicecycles Starts, And The Last Guy Starts Driving Around - The Host Must Leave.
(To Be Safe Wait Until There's 1 Minute Left On The Clock)

This Does A Few Things,
- It Does Not Allow Any Progress For The Red Player To Be Recorded.
- It Does Record The Rounds That Have Been Won For The Other Three Players.
- It Does Give The Three Players The Payout From The Game, And Skipping The End Cutscene For A Winner, Puts Everyone Back To The Menu Instead Of Crashing The Game.

Once Someone Has Won Every Event, Except Slicecycles.
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Start A New Game, And Let The Person With 8 Out Of 9 Rounds Won, Win All Three Rounds And Slicecycles.

Red Player Must Now Stay Until The End Of Slicecycles!

This Will Crash The Game Mid-Ending Cutscene For All Four People.
- Before This Happens, Move Steam Over To A Second Screen Or You May Have Trouble Closing The Crashed Game.

It Does Check To See If You Won Everything + Slicecycles Right Before The Crash, And If You Had 8 Rounds Won Before This Point - You Will Be Awarded With Both Win Big And TK's Favorite.

Restart This Process For Every Person Until All Four Of You Have All Three Achievements.

Switching Hosts Will Be Required At Some Point, As Red Gets No Progress When He Locks In His Friend's Wins.
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More Tips Discovered While Helping
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1. ) Some People Can Not Host. This Is A Bug.
As Red Player, You Will See the Other Players Try To Load In,
(Character Model Lights Up But Their Name Never Appears)
- For Them It Will Just Say "Player Connecting" Forever.
- This Happens To Me. If It Happens To You, You Can Never Host.
- Find Another Guy To Host From Your Party Of 4.

2. ) If Green Player Alt + F4's After An Event - It Does Give Red Player Progress, If Red Won The Previous Event.

3.) For Best Results, At Least Two People Need To Be Able To Host.

4.) Rarely, While Matchmaking, The Lobby Can Become Bugged. This Prevents All Four People From Joining The Game, Even If A Few Are Already In Your Lobby.
- Closing Dead Rising 2, Back To Windows, And Restarting It Fixes This Glitch.

Good Luck!