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