The "time-requirements" in this game are poor organized.
While you deliver a pizza, the waiting and cook time should pause, after all, in real life, you don't wait that long to see the customer jump happy after you gave him a pizza...
---Small and obvious spoiler ahead---
The last badge should be ranked Impossible.
I mean, after getting Gold in 35 customers, you still have to make awesome pizzas for 15 more levels (after all, Papa also needs to give you a Gold).
From Night 9 to 20 all I did was use the Rifle (and of course other weapon, which I changed from time to time).
From each 5 zombies that I killed, 4 I got with headshots.
And I still didn't get the badge...
There should be a counter to see how much we have gone through.
Just like in Fancy Pants.
There you can see how many "things" (forgot the name) you've got and still need to complete the task.
 "Don't Look Back"){kind=icon}
 "The Jumper"){kind=icon}
 "Battle Gear"){kind=icon}
 "Papa's Pizzeria"){kind=icon}
 "The Last Stand"){kind=icon}
 "colourPod"){kind=icon}
 "Ragdoll Avalanche 2"){kind=icon}