Kill an enemy with a single shot to the head

Successfully kill an enemy with one shot

Perform a multi-kill with a melee weapon

Perform a multi-kill with a grenade

Successfully complete your first kill of an opposing team member in Multiplayer

Kill 3 members of the opposing team with a melee attack before you die in Multiplayer

Complete the "It's All Greek To Me" level

Complete the "Something's Amish" level

Complete the "Handicapable" level

Complete the "Pussy Whipped" level

Complete the "No Cheese, Please" level

Complete the "Long John Peter" level

Complete the "Santa's Sweatshop" level

Complete the "Chickens In Space" level

Complete the "Chicken Fight!" level

Defeat 10 enemies with a melee weapon

Shut out the other team from scoring in Capture the Greased-Up Deaf Guy

Choose Meg for a Multiplayer match

Taunt 25 times in any Multiplayer match

Kill 60 enemies with grenades/explosives

Use the collectible special inventory items 25 times in Story Mode

Kill 75 enemies with headshots

Switch between Brian and Stewie 10 times in Story Mode

Kill Meg during any Multiplayer Match

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

Kill yourself with a grenade or satchel charge

Win a Deathmatch mode (free-for-all or as a team)

Win an Infiltration map

Win a Capture the "Greased-Up Deaf Guy" match

Taunt a dead opponent with Quagmire in Multiplayer

Earn 10 stars in Challenge mode

Taunt 5 times in a row with Peter

Play poorly during the final showdown

Survive 15 waves in Multiverse Madness

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

Hang around the room with Quagmire in a baby costume for 30 seconds

Kill Vernon

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