Smash your opponent into something 20 times in the "Chicken Fight!" level

Complete the "Santa's Sweatshop" level

Use the collectible special inventory items 25 times in Story Mode

Kill 500 enemies using Brian

Complete the "No Cheese, Please" level

Perform a multi-kill with a grenade

Complete the "Something's Amish" level

Burn the pot fields in the "Something's Amish" level

Destroy all of the piñatas in the "It's All Greek to Me" level

Defeat 10 enemies with a melee weapon

Kill an enemy with a single shot to the head

Locate room 899

Subdue a person