Here is the full list of all 58 Marvel: Ultimate Alliance 2 achievements worth 1,000 gamerscore.
Defeated 25 maps on Super Heroic or Legendary Difficulty without revival or map reload.
Earned all Trivia rewards.
Scored 30 Trivia Fusions
Collected 200 Team Boost.
Defeated all Act III missions on Legendary Difficulty.
Defeated 12 mission bosses on Super Heroic or Legendary Difficulty without reviving or reloading.
Defeated all Act II missions on Legendary Difficulty.
Defeated all Act I missions on Legendary Difficulty.
Completed all combat mastery goals listed on the Stats page.
Performed all 5 recommended training Fusions in Latveria.
Defeated all Act II and III missions as an Anti-Registration team.
Defeated 75 foes in "Balance"
Threw all the proximity mines in "Balance".
Completed "Escort Duty" without destroying any turrets.
Completed "Escort Duty" without disabling any floor hazards.
Completed "Insidious Alliance without breaking any Health Containers"
Completed "Insidious Alliance" with all four heroes alive.
Completed all optional mission objectives.
Fought back an ambush.
Collected 125 Team Boosts.
Stopped a convoy.
Performed all Fusions by combining every available pairing of 24 heroes.
Unlocked 23 alternate costumes.
Earned 20 high scores for each type of Fusion: Targeted, Guided, and Clearing.
Rescued a hideout.
Performed 10 revivals.
Had 10 special conversations between characters with a history while in an HQ map.
Collected 125 Dossiers
Earned 12 Gold Medals from Simulator Missions.
Defeated "Overload" as the X-Men.
Defeated 2 foes within 10 seconds in "Insidious Alliance."
Completed all Power training goals listed on the Stats page.
Earned 8 Silver Medals from Simulator Missions.
Earned 4 Bronze Medals from Simulator Missions.
Earned Mission Succeeded on a Simulator Mission in Co-Op and returned to the Simulator menu.
Completed all melee training goals listed on the Stats page.
Collected 10 Concept Art Bundles in HQ maps.
Finished what you started.
Defeated all Act II and III missions as a Pro-Registration team.
Collected 30 Audio Logs.
Correctly answered 15 Trivia questions.
Freed a country.
Performed a Break and enter.
Collected 50 Team Boosts.
Repaid a favour.
Ambushed your opponents.
Completed 24 maps in Co-Op.
Defended a convoy.
Raided a hideout.
Chose a side.
Defended your leaders.
Protected a city.
Completed 8 maps in Co-Op.
Crashed a castle
You or other players on your team destroyed 250 health containers.
Performed 10 Fusions with another player-controlled hero in a Co-Op game.
Completed a map in Co-Op.
Toppled a dictator.