At the main menu, select "Options", choose "Cheat", and enter one of the following codes to activate the corresponding cheat function. Note: Enabling codes will disable the ability to save the game.
|All characters in Multiplayer mode||CAST|
|All weapons in Multiplayer mode||DKSD|
|All weapons in Single Player mode||GTSM|
|One shot kills||MNKY|
Successfully complete the indicated task to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", "My profile", "View all my games", then the game and view stats.
- Bestest Infiltrator: Win an Infiltration map.
- Big Dipper: Earn all 21 stars in challenge mode.
- Bipolar: Switch between Brian and Stewie 10 times in Story mode.
- Bird Is The Word: Taunt 5 times in a row with Peter.
- Boom Headshot: Kill 75 enemies with headshots.
- Bunch of Chumps: Survive 15 waves of enemies in Multiverse Madness.
- Cartoon Apocalypse: Survive 30 waves in Multiverse Madness.
- Chicken Fight!: Complete the "Chicken Fight!" level.
- Chickens In Space: Complete the "Chickens In Space" level.
- Day Labor: Destroy all of the piñatas.
- Employee of the Month: Kill Vernon.
- First Kill: Successfully complete your first kill of a member of the opposing team in Multiplayer.
- Grease Can't Save You Now: Win a Capture the "Greased-Up Deaf Guy" match.
- Handicapable: Complete the "Handicapable" level.
- Head Shot: Kill an enemy with a single shot to the head.
- Help From My Friends: Acquire any collectible special inventory items and use it 25 times in Story Mode.
- How Do I Jump?: Kill yourself with a grenade or satchel charge.
- IEDead: Kill 60 enemies with grenades/explosives.
- It's All Greek To Me: Complete the "It's All Greek To Me" level.
- Justified: Kill 500 enemies using Brian.
- Kings of Quahog: Win a deathmatch mode (free-for-all or as a team).
- Little Dipper: Earn 10 stars in challenge mode.
- Lockdown: Shut out the other team from scoring in Capture the "Greased-Up Deaf Guy".
- Long John Peter: Complete the "Long John Peter" level.
- Mort Will Now Lend You Credit: Buy everything available in the Store.
- Mr. Unpopular: Select Meg as a character for a Multiplayer match.
- Multi-kill: Perform a multi-kill with a melee weapon.
- Multi-kill with grenade: Perform a multi-kill with a grenade.
- No Cheese, Please: Complete the "No Cheese, Please" level.
- No Place Like Home: Complete the "No Place Like Home" level.
- Obsessed: Complete all secondary objectives.
- One Shot Kills: Successfully kill an enemy with one shot.
- Penny Pincher: Successfully collect $50,000.
- Pervert: Hang around Quagmire in a baby costume for 30 seconds.
- Pussy Whipped: Complete the "Pussy Whipped" level.
- Roadhouse: Kill 3 members of the opposing team with a melee attack before you die in Multiplayer.
- Santa's Sweatshop: Complete the "Santa's Sweatshop" level.
- Scorched Earth: Burn the Amish pot fields.
- Shut Up Meg: Kill Meg during a Multiplayer Match.
- Something's Amish: Complete the "Something's Amish" level.
- Stewie-nator: Kill 500 enemies using Stewie.
- Teabag a D-Bag: Taunt a dead opponent with Quagmire in Multiplayer.
- Teabaggin': Successfully perform a taunt 25 times.
- The Cleaner: Get a 10 kill streak in Deathmatch.
- There Is No Cake: Unlock all other Achievements found in the game.
- Ugly Tastes Terrible: Play poorly during the final showdown.
- We Be Clubbing: Defeat 10 enemies with a melee weapon.
- Wrecking Ball: Smash your opponent into something 20 times in the "Chicken Fight!" level.