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