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