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