Need some recommendations for the Real Deal Acheivement

[Sonic za Hedgehog]

Which campaign is easiest for this?
Important strategies? (usually on split-screen)
Possibly on solo?  

[Ninja Sparda]

the best campaign: the one your best at
stratagies: dont suck, take things slow but quick
solo: good luck cuz your going to be on for a LONG time if you try it solo  

[Muddy Armadillo]

Campaign biggrin ead Center (little to no witches this early in the game)
Co-op strats:Get what weapons suit you, shove constantly, soda collection part: one guy stays on balcony and shoots oncoming horde, other grabs soda and runs like hell
Solo:It'll be a b****, but it's possible  

[Garret Erikson]

Dead Center. Play alone, until the Finale. If you don't get a Magnum in the first conference room, start over. Take it slow. Find an Auto Shotgun and speedrun if you are good at it.

Once you get to the finale, then invite friends.

The director is more of a pain in the a** if you have more people playing, but once you are in the finale, you almost need help getting the gas cans.

Thats how it worked for me. I only restarted about 20 times I believe? I posted it in this guild somewhere...