Banana Bomb: Complete Shotgun Challenge 3.
Bridge Kit: In the Beefcake Breakfast, get the crate located on a rooftop.
Earthquake Weapon: Complete Jetpack Challenge 3.
Mad Cows: Complete Shotgun Challenge 3 with all golds.
Nuclear Bomb: Complete Deathmatch Challenge 10 with all golds.
Super Sheep: Complete Sheep Challenge 3