Mortal Kombat vs. DC Universe Cheats - Xbox 360

Achievements
Complete each achievement to get the allotted gamerscore:

Clown Prince of Crime (5) - Complete the Joker's Kombo Challenge.
Combo Champion (20) - Perform a 10-hit combo in Arcade Mode.
Arcade Master (20) - Beat Arcade Max without using a continue.
Bring It On! (5) - Complete Jax's Kombo Challenge.
Cat Burglar (5) - Complete Catwoman's Kombo Challenge.
Challenger! (10) - Play 10 Ranked Matches Online.
DC Arcade Champion (50) - Complete Arcade Mode with all DC characters.
Deadly Alliance (20) - Complete Story Mode MK Chapter 5.
Mortal Kombat Champion (25) - Finish Arcade Mode with an MK character.
Omega Effect (5) - Complete Darkseid's Expert Combos.
Online Champion (50) - Win 25 Ranked Matches in a row.
Outworld's Princess (5) - Complete Kitana's Kombo Challenge.
Princess Diana (5) - Complete Wonder Woman's Kombo Challenge.
Relentless! (50) - Play 100 Chat Lobby Matches Online.
Emperor of Outworld (5) - Complete Shao Kahn's Expert Combos.
Evil Genius (5) - Complete Lex Luthor's Kombo Challenge.
Fastest Man Alive (5) - Complete the Flash's Kombo Challenge.
Fatality! (10) - Do anyone's Fatality.
Free Fallin' (25) - Perform a Free-Fall Transition.
Get Over Here! (5) - Complete Scorpion's Kombo Challenge.
Grand Master (5) - Complete Sub-Zero's Kombo Challenge.
Green Lantern's Light! (5) - Complete Green Lantern's Kombo Challenge.
Heroic Brutality! (10) - Do anyone's Heroic Brutality.
Humiliation! (20) - Get a Flawless Victory Online.
Infiltration (15) - Complete Story Mode MK Chapter 3.
Invasion (15) - Complete Story Mode DC Universe Chapter 3.
Less Talk, More Fight! (20) - Win a Chat Room Match Online.
Master of Souls (5) - Complete Shang Tsung's Kombo Challenge.
MK Arcade Champion (50) - Complete Arcade Mode with all MK characters.
Shaolin Monk (5) - Complete Liu Kang's Kombo Challenge.
SHAZAM! (5) - Complete Captain Marvel's Kombo Challenge.
Special Forces (5) - Complete Sonya's Kombo Challenge.
Special Move Master (100) - Perform All Special Moves.
Strange Forces (10) - Complete Story Mode DC Universe Chapter 1.
Super Hero (25) - Finish Arcade Mode with a DC character.
Supreme Champion (50) - Finish Kombo Challenge mode on MK and DC.
Tarkatan Champion (5) - Complete Baraka's Kombo Challenge.
The Assassin (5) - Complete Deathstroke's Kombo Challenge.
The Caped Crusader (5) - Complete Batman's Kombo Challenge.
The Competitor (20) - Play 200 Versus Matches.
The Pugilist (25) - Perform Klose Kombat.
The Finisher (100) - Perform all finishing moves in the game.
The Man of Steel (5) - Complete Superman's Kombo Challenge.
The Mercenary (5) - Complete Kano's Kombo Challenge.
The Thunder God (5) - Complete Raiden's Kombo Challenge.
The Ultimate Evil! (20) - Complete Both Mortal Kombat and DC Universe Stories.
Universe Reborn (50) - Complete the DC Universe side of Story Mode.
Unlikely Alliance (20) - Complete Story Mode DC Universe Chapter 5.
Worlds Collide (10) - Complete Story Mode MK Chapter 1.
Worlds Remade (50) - Complete the MK side of Story Mode.

Unlock Characters
After unlocking them you need to hold down [RB] on character select to use them:

Darkseid - Beat the DC side of story mode.
Shao Kahn - Beat the MK side of story mode.

Unlock Alternate Costumes
Press [Start] when choosing a person at character selection screen.