Scott Pilgrim vs. the World Cheats - Xbox 360

Cheat Mode
Enter the following codes at the title screen:

[Down], [RB], [UP], [LB], [Y], [B] - Allow Two players to select the same character.
[X], [X], [X], [A], [B], [A], [Y], [Y] - Begin level with Power of Love.
[A], [B], [A], [X], [A], [B], [B] - Enables Blood Mode.
[Up], [Up], [Down], [Down], [Up], [Up], [Up], [Up] - Change coin sprites into animals.
[Right], [Right], [B], [RB], [Right], [Right], [B], [LB] - Boss Rush.
[Down], [Up], [Right], [Down], [Up], [Right], [Down], [Up], [Right], [Right], [Right] - Unlock Zombie Mode.
[LB], [LB], [LB], [RB], [RB], [RB], [LB], [RB] - Sound Check Level.

Achievements
Complete each achievement to receive the allotted gamerscore:

"Chaudown" (30) - Unlock and call all strikers.
Armed And Dangerous (20) - Defeat at least 200 enemies using interactive objects.
New Challenger (10) - Defeat Matthew Patel without losing a life.
One Man Army (20) - Clear the game in single player on the "Supreme Master" difficulty setting.
Shopaholic (20) - Buy all the items of a shop.
Dirty Trick (10) - Defeat an enemy by throwing an object at him while he's already down.
Get The Girl (10) - Clear the game once with Scott.
Gourmet (20) - Eat every food items.
Invulnerable (10) - Play through a World and reach the boss without getting hit.
The Power Of Friendship (20) - In a multiplayer game, reanimate another player at least 25 times.
Twin Dragons (10) - Defeat the Twins simultaneously.
Vigilante (20) - Defeat all enemies in a World, excluding the boss.

Additionally, there are three Knives DLC achievements:

It's All In The Reflexes (10) - Catch a flying object at least 25 times with Knives.
Speed Run (20) - Clear the game in 90 minutes or less with Knives.
Ninja Somersault (20) - Perform at least 10 consecutive head stomps successfully with Knives.

Additionally, there are four Online Multiplayer + Wallace Pack achievements:

And... It's a Wrap! (10) - Clear the game once with Wallace Wells.
Everybody wants to play (10) - Played Online with all characters at least once (including Wallace Wells).
Wallace the novice! (10) - Completed your first online match with Scott Pilgrim Online Multiplayer and Wallace pack.
Wallaciraptor! (20) - Knockout 200 enemies in online mode with Scott Pilgrim Online Multiplayer and Wallace pack.

Skip Snowy Toronto
In the Snowy Toronto stage, fight your way to Hillcrest Park. Without killing the last enemy before you're allowed to move on, move over to the middle of the right side of the screen and hold up and right. You'll see your character slowly start to move off screen, after which you can dash blindly through the level with none of the enemies loaded. After the screen dips down and back up, hold up and right to make sure you enter the Subspace door at the end of the level. This is a great way to earn the Invulnerable trophy with very little effort.

Unlock Characters
Mr. Chau as an assist - After a stage, you will see Mr Chau on a random stage, go to that stage and you will have to fight him, beat him and then you get him.
Nega-Scott - Beat The Game With Scott, Kim, Skills and Ramona.

Unlock Mobile's Secret House
Get the key in level 6 and fight some wolverines. Notice the small house in the background with a path. Keep walking along the top of the screen and to enter a secret path. Note: Mobile sells a special training manual for $57.50 that unlocks a special move.

Wallace Wells' Secret Shop
Go to the shopping district in the Frozen Suburbs. Find the ramp that leads down down to an underpass. Approach the star painted on the rear wall. A cement panel will open, allowing access to a shop that sells expensive powerful items.

Video Store Items
Pay the $504.25 fine at the video store to unlock the corresponding items for purchase for $4.95. Note: After leaving the store you will have to pay the fine again to reenter.

The Mystical Head - Extra life, maximum of nine.
Seven Shaolin Masters - Gives +100 XP, +10 DEF, +10 SPD, +10 WP, +10 STR.
Alien vs. T-Rex - Gives +20 STR.
Alone And Disturbed - Gives +1,500 experience points.
I Love Your Boyfriend - Gives +320 XP, +15 DEF, +15 WP.