Please note that if you are using cheats you won't be able to save the game.

Cheat                                                                                 Result

Up, Up, Down, Down, Left, Left, Left, Start (In Game) - Characters
Up, Down, Left, Right, Left, Right, Start (In Game) - Costumes
Left, Right, Right, Left, Up, Up, Right, Start (Main Menu) - Diaries
Down, Down, Down, Right, Right, Left, Down, Start (Main Menu) - Dossier Files
Right, Right, Up, Down, Up, Up, Left, Start (In Game) - Fusion Power
Down, Left, Left, Up, Right, Up, Down, Left, Start, (In Game) - Hulk
Left, Left, Right, Right, Up, Down, Up, Down, Start (In Game) - Jean Grey
Up, Up, Down, Down, Up, Up, Up, Down, Start (Hero Details Menu) - Money
Up, Left, Left, Up, Right, Right, Up, Start (Main Menu) - Movies
Up, Up, Down, Down, Left, Right, Right, Left, Start (In Game) - Powers
Up, Right, Right, Down, Right, Down, Left, Right, Start (In Game) - Thor

Unlockable                                  How to unlock

Deadpool - Beat the D.C. Level
Green Goblin and Venom - Beat them at the end of Wakanda Act 3
Hulk - Collect all 5 Gamma Regulators
Iron Fist - Choose the Rebel side when faced with the choice
Jean Grey - Collect all 5 M'Kraan Shards
Ms. Marvel - Beat the NYC Level
Nick Fury - Beat the Game
Songbird - Choose the Register side when faced with the choice
Thor - Collect all 5 Asgardian Runes

A House Divided (Silver) - Defend your leaders.
A More Perfect Union (Bronze) - Finish what you started.
Above and Beyond (Silver) - Collect 200 Team Boosts.
All Options on the Table (Bronze) - Defend a convoy.
Alliance Reborn (Bronze) - Break and enter.
Back in Action (Bronze) - Perform 10 revivals.
Coalition of the Willing (Bronze) - Crash a castle.
Collateral Damage (Bronze) - Stop a convoy.
Costume Collector (Bronze) - Unlock 23 alternate costumes.
Decorated Veterans (Bronze) - Complete 24 maps in Co-Op.
Defending Our Way of Life (Bronze) - Rescue a hideout.
Distinguished Service (Bronze) - Collect 50 Team Boosts.
Every Trick In The Book (Silver) - Complete all combat mastery goals listed on the Stats page.
Experienced Allies (Bronze) - Complete 8 maps in Co-Op.
Extraordinary Heroism (Bronze) - Collect 125 Team Boosts.
Fallen Star (Silver) - Ambush your opponents.
Freedom Isn't Free (Bronze) - Raid a hideout.
Grave and Growing (Bronze) - Free a country.
Heroes Unite (Bronze) - Perform 10 Fusions with another player-controlled hero in a Co-Op game.
I'm With Captain America (Silver) - Defeat all Act II and III missions as an Anti-Registration team.
I'm With Iron Man (Silver) - Defeat all Act II and III missions as a Pro-Registration team.
If You're Not With Us (Bronze) - Choose a side.
Immortal Heroics (Gold) - Defeat 25 maps on Super Heroic or Legendary Difficulty without revival or map reload.
Iron and Blood (Silver) - Fight back an ambush.
Knowns and Unknowns (Bronze) - Repay a favor.
Legendary Alliance (Silver) - Defeat all Act III missions on Legendary Difficulty.
Legendary Schism (Bronze) - Defeat all Act I missions on Legendary Difficulty.
Legendary War (Bronze) - Defeat all Act II missions on Legendary Difficulty.
Listening In (Bronze) - Collect 30 Audio Logs.
Melee Training (Bronze) - Complete all melee training goals listed on the Stats page.
Mission Accomplished (Bronze) - Topple a dictator.
Oceans No Longer Protect Us (Bronze) - Protect a city.
Old Friends (Bronze) - Have 10 special conversations between characters with a history while in an HQ map.
Platinum Award (Platinum) - Obtain all other trophies.
Potential Evidence (Bronze) - Collect 10 Concept Art Bundles in HQ maps.
Power Training (Bronze) - Complete all Power training goals listed on the Stats page.
Powers of Two (Gold) - Perform all Fusions by combining every available pairing of 24 heroes.
Rookie Squad (Bronze) - Complete a map in Co-Op.
Seek and Destroy (Bronze) - Complete all optional mission objectives.
Sim Amateur (Bronze) - Earn 4 Bronze Medals from Simulator Missions.
Sim Champion (Bronze) - Earn 12 Gold Medals from Simulator Missions.
Sim Expert (Bronze) - Earn 8 Silver Medals from Simulator Missions.
Sim Team-Up (Bronze) - Earn Mission Succeeded on a Simulator Mission in Co-Op and return to the Simulator menu.
Superior Intel (Bronze) - Collect 125 Dossiers.
Tactical Training (Bronze) - Perform all 5 recommended training Fusions in Latveria.
Trivia Buff (Bronze) - Correctly answer 15 Trivia questions.
Trivia Genius (Bronze) - Earn all Trivia rewards.
Trivia Team-Up (Bronze) - Score 30 Trivia Fusions.
Uncontained Aggression (Bronze) - You or other players on your team must destroy 250 health containers.
Undefeated Heroes (Silver) - Defeat 12 mission bosses on Super Heroic or Legendary Difficulty without revival or map reload.
United We Stand (Silver) - Earn 20 high scores for each type of Fusion: Targeted, Guided, and Clearing.