Not hard if you use good strategy. Use the gun a lot early on and save money for later. The health bonus really helps. I had full everything playing the last level and didn't even use the nukes.
Stand around the corner in tight 2, put a deck of cards on the space bar, then go have lunch. Come back and see if you've got the badge yet. I had quiche but other food will work too.
 "Army of Destruction"){kind=icon}
 "Boxhead: 2Play Rooms"){kind=icon}
 "Typing Ninja Hunter"){kind=icon}
 "Red"){kind=icon}
 "Pandemic 2"){kind=icon}