We Be Clubbing

Defeat 10 enemies with a melee weapon

Multi-Kill

Perform a multi-kill with a melee weapon

Handicapable

Complete the "Handicapable" level

Something's Amish

Complete the "Something's Amish" level

Scorched Earth

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

How Do I Jump?

Kill yourself with a grenade or satchel charge

It's All Greek To Me

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

Bipolar

Switch between Brian and Stewie 10 times in Story Mode

Multi-kill with a grenade

Perform a multi-kill with a grenade

Day Labor

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

Kings of Quahog

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

Head Shot

Kill an enemy with a single shot to the head

One Shot Kills

Successfully kill an enemy with one shot

Shut Up Meg

Kill Meg during any Multiplayer Match

First Kill

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