Here is the full list of all 58 Marvel: Ultimate Alliance achievements.
Completed a level with at least 1 other player
Silver Surfer was unlocked as a playable hero.
Defeated 4000 enemies.
Unlocked all the outfits for Doom.
Dr. Doom was utterly defeated.
Nick Fury was unlocked as a playable hero.
Doom has spoken with himself.
Unlocked all the outfits for Cyclops.
The Mighty Galactus was toppled
Daredevil was unlocked as a playable hero.
Titannus was defeated.
Black Panther was unlocked as a playable hero.
Deathbird was crushed.
Unlocked all the outfits for Sabretooth.
Gladiator was defeated.
Sabretooth has been mistaken for Wolverine
Answered 150 Trivia questions correctly.
Loki was defeated.
Ymir fell to the forces of good.
Performed 50 Finishing Moves.
Executioner and Enchantress were defeated.
Performed 5 Finishing Moves.
Mephisto was struck down.
Blackheart was defeated.
Magneto has spoken to Xavier.
Threw 5 Enemies off a Ledge.
Arcade was Defeated.
Answered 20 Trivia Questions Correctly In A Row.
The evil Mandarin was crushed by the forces of good.
Grey Gargoyle was defeated.
The Mighty Kraken was defeated.
Tigershark and Attuma were defeated.
M.O.D.O.K was defeated.
Defeated 100 Enemies.
Answered 15 Trivia questions correctly.
Fin Fang Foom was defeated.
Defeated 10 Enemies.
Attained gold on all comic missions.
Completed 25 levels with at least 1 other player.
Beat Marvel: Ultimate Alliance in Hard Mode.
Threw 50 Enemies off a ledge.
Threw 500 enemies off a ledge.
Won 1 Arcade Mode Level.
Won 20 Arcade Mode Levels.
Won 15 Arcade Mode levels consecutively.
Win 3 Arcade levels consecutively.
Won 100 Arcade Mode Levels.
Completed 1 level with 3 other players.
Completed 25 levels with 3 other players.
Performed 200 Finishing Moves.
Completed Skrull Cityscape level without defeating a single enemy.
Unlocked ALL outfits for EVERY hero
Unlocked all the outfits for the Hulk.
Unlocked all the outfits for Hawkeye.
Unlocked all the outfits for Nightcrawler.
Cyclops has spoken with Jean.
Unlocked all the outfits for Magneto.
Unlocked all the outfits for Venom.