Kill 3 enemies while they are distracted

Expand inventory slots to max.

Open all of the safes and locks in the game.

Kill 50 enemies with the Assault Rifle.

Destroy 50 'Space Onions'.

Shoot a zombie dog or a licker out of the air.

Shoot the grenade you fed to an enemy.

Destroy a Mr. Raccoon.

Increase your inventory slots.

Open a portable safe.

Customize a weapon.

Counterattack with a sub-weapon.

Use Wooden Boards to board up a window.