Here is the full list of all 58 Marvel: Ultimate Alliance 2 achievements.
Perform all Fusions by combining every available pairing of 24 heroes.
Complete 24 maps in Co-Op.
Defeat all Act II and III missions as a Pro-Registration team.
Defeat all Act III missions on Legendary Difficulty.
Defeat all Act II missions on Legendary Difficulty.
Ambush your opponents.
Collect 200 Team Boosts.
Defend a convoy.
Defeat 12 mission bosses on Super Heroic or Legendary Difficulty without revival or map reload.
Earn all Trivia rewards.
Raid a hideout.
Defeat all Act I missions on Legendary Difficulty.
Perform all 5 recommended training Fusions in Latveria.
Defeat 75 foes in "Balance"
Throw all the proximity mines in "Balance".
Score 30 Trivia Fusions.
Correctly answer 15 Trivia questions.
Complete 8 maps in Co-Op.
Earn Mission Succeeded on a Simulator Mission in Co-Op and return to the Simulator menu.
Perform 10 Fusions with another player-controlled hero in a Co-Op game.
Complete a map in Co-Op.
Complete "Escort Duty" without destroying any turrets.
Complete "Escort Duty" without disabling any floor hazards.
Earn 12 Gold Medals from Simulator Missions.
Collect 125 Team Boosts.
Defeat "Overload" with the X-Men.
Unlock 23 alternate costumes.
Complete "Insidious Alliance" with all four heroes alive.
Progress through "Insidious Alliance without breaking any Health Containers"
Defeat 2 foes within 10 seconds in "Insidious Alliance."
Earn 8 Silver Medals from Simulator Missions.
Earn 4 Bronze Medals from Simulator Missions.
Defeat 25 maps on Super Heroic or Legendary Difficulty without revival or map reload.
Collect 30 Audio Logs.
Complete all combat mastery goals listed on the Stats page.
Complete all melee training goals listed on the Stats page.
Earn 20 high scores for each type of Fusion: Targeted, Guided, and Clearing.
Complete all optional mission objectives.
Finish what you started.
Defeat all Act II and III missions as an Anti-Registration team.
Complete all Power training goals on the Stats page.
Collect 10 Concept Art Bundles in HQ maps.
Free a country.
Collect 125 Dossiers.
Break and enter.
Perform 10 revivals.
Fight back an ambush.
Repay a favour.
Collect 50 Team Boosts.
Stop a convoy.
Have 10 special conversations between characters with a history while in an HQ map.
Rescue a hideout.
Choose a side.
Defend your leaders.
Protect a city.
Crash a castle.
You or other players on your team must destroy 250 health containers.
Topple a dictator.