All characters:

At the character selection screen when at an Xtraction point where you usually save the game or switch characters, press Right, Left(2), Right, Up(3), Start to unlock all characters.

Invincibility:

At the character selection screen when at an Xtraction point where you usually save the game or switch characters, press Down, Up, Down, Up, Right, Down, Right, Left, Start.

Level 99 characters:

At the character selection screen when at an Xtraction point where you usually save the game or switch characters, press Up, Down, Up, Down, Left, Up, Left, Right, Start.

Add one point to all skills:

At the character selection screen when at an Xtraction point where you usually save the game or switch characters, press Left, Right, Left, Right, Down, Up, Start to add one point to all skills.

Extra melee damage:

While playing the game, press Left(2), Right, Left, Right, Up, Start.

Fast characters:

While playing the game, press Up(3), Down, Up, Down, Start.

Infinite Xtreme tokens:

While playing the game, press Left, Down, Right, Down, Up(2), Down, Up, Start.

100,000 Tech-Bits:

At the store run by Forge or Beast, press Up(3), Down, Right(2), Start. If you entered the code correctly, you will hear the sound of Tech-Bits.

All Danger Room courses:

At the Danger Room course menu, press Right(2), Left(2), Up, Down, Up, Down, Start to unlock all Danger Room courses.

All skins:

At the team management screen, press Down, Up, Left, Right, Up(2), Start to unlock all skins.

All comics:

At the review menu, press Right, Left(2), Right, Up(2), Right, Start to unlock all comics.

All concept art:

At the review menu, press Left, Right, Left, Right, Up(2), Down, Start to unlock all concept art.

All game cinematics:

At the review menu, press Left, Right(2), Left, Down(2), Left, Start to unlock all game cinematics.

All loading screens:

At the review menu, press Right, Left, Right, Left, Up(2), Down, Start to unlock all loading screens.