What is a cheat code that can unlock everything on WWE 13?

In order to Unlock all the title belts in WWE 12 do the following

Champion of Champions - Win any title at the Clash Of The Champions arena.

ECW Championship (Classic) - Win any title in an Extreme Rules match in WWE Universe mode (You can use the Customize Freely option to do this if necessary)

Hardcore Championship - Win any title in a "Falls Count Anywhere" match in WWE Universe mode

Million Dollar Championship - Win any title with Ted DiBiase in WWE Universe mode

WCW Championship (Classic) - Complete the Hero storyline (Jacob Cass) in Road to WrestleMania mode

World Heavyweight Championship (Spray Painted) - In the Hero storyline (Jacob Cass) in Road to WrestleMania mode, view the 13-1 cutscene after Big Show paints WCW on the championship

World Tag Team Championship - Win the WWE Tag Team Championship in WWE Universe mode (This match must be created automatically in WWE Universe mode)

WWE Attitude Era Championship - Win the WWE Championship with Stone Cold Steve Austin in WWE Universe mode

WWE Championship (Spray Painted) - In the Hero storyline (Jacob Cass) in Road to WrestleMania mode, win the Elimination Chamber match

WWE European Championship - In the Villain storyline (Sheamus) in Road to WrestleMania mode, win the United States title (10-1 cutscene)

WWE Intercontinental Championship (Classic) - Win the IC title in WWE Universe mode

WWE Light Heavyweight Championship - Win any title with Rey Mysterio in WWE Universe mode

WWE Tag Team Championship (Classic) - In the Hero storyline (Jacob Cass) in Road to WrestleMania mode, view the 10-1 cutscene after Animal's appearance in the Jacob Cass vs. Kofi Kingston match

WWE Undisputed Championship - Win the WWE Championship at a PPV event with Triple H in WWE Universe mode