Here is the full list of all 43 Marvel Avengers: Battle for Earth achievements worth 1,000 gamerscore.
Win a fight without being hit in Campaign.
Perform a Close-Combat.
Perform a Counter Kick.
Dodge a Super Attack.
Chain two Super Attacks.
Chain two Super Attacks by switching characters.
Chain 3 Super Attacks by switching characters twice.
Chain 4 Super Attacks by switching characters twice.
Counter a Super Attack with another Super Attack.
Use your Breaker power to break a Chain.
Use your ULTRA Attack.
Win a battle in CO-OP.
Perform a 4x Combo in CO-OP.
Finish every Trial.
Reach the FAST velocity when doing a Super Attack 5 times in a row.
Change the costume of one of your character.
Win a match without dodging in Campaign.
Unlock the highest Rank.
Get 100 000 Experience points.
Win a battle with Captain America and Iron Man.
Win a battle with Wolverine and Phoenix.
Win a battle with Thor and Loki.
Win a battle with Super-Skrull and Veranke.
Win a battle with Scarlet Witch & Storm.
Win a battle with Human Torch and Iceman.
Win a battle with Thor & Storm.
Win a battle with Phoenix & Human Torch.
Win a battle with Doctor Doom & Doctor Strange.
Win a battle with Super Skrull & Doctor Doom.
Win a battle with Wolverine & Magneto.
Win a battle with Hawkeye & Black Widow.
Win a battle with Hulk & Iron Man.
Win a battle with Spiderman & Venom.
Finish the first part of the Campaign.
Finish the Campaign mode.
Finish all character's challenge.
Win the arcade mode once.
Finish the Tutorial challenges.
Win a fight without changing characters in Campaign.
Obtain an adamantium grade.
Win your first battle in Campaign.
Fire projectiles during the ULTRA attack in CO-OP.
Win a Tournament