http://www.kongregate.com/forums/3-general-gaming/topics/34897-pandemic-2-better-100-day-strategy
follow that as closely as possible. Of course it still involves lots of luck, but I just got the t even want to know how many times it took though.
I don't know if it's been said before, but this seems like it could translate fairly easily into a fun multiplayer game. nerdook, this is your next mission.
Finished the 5-day achievement in less than 10 tries. I even had a sub-par day one and two, and still almost made it on day 4. As long as you get lucky enough to make a decent amount of money in the first few days, it's not impossible at all. Just dump the money you do make into the height, band, and rockets.
 "Pandemic 2"){kind=icon}
 "Orbital Onslaught"){kind=icon}
 "Hedgehog Launch"){kind=icon}