Full list of all 48 Young Justice: Legacy achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Use all the powers of the heroes
Buy all enhancements
Unlock all characters
Complete all challenges
Get all A Grades in YJ Challenges
Get 50% A Grades in YJ Challenges
Complete half of the challenges
Reach level 40
Complete the game on Hard Difficulty
Complete all missions in co-op mode
Get all Red Arrow Journals
Get all the Dioramas
Escape the Avalanche Stage during “Go with the Flow” in less than 5 minutes
Don't activate the Statues in The Warriors Stage during “Tag Team”
Collect all the Alternate Costumes
Obtain A Grades in all Missions
Finish the game
Defeat Blockbuster
Activate Squad Boost 20 times
Defeat The Riddler
Avoid search light in Gotham Docks
Don’t break any Statue in the Museum Stage during “A Hostage Crisis”
Avoid damage from the spike trap in Atabey's Temple Stage during “The Goddess Shrine”
Defeat Psimon
Complete 10 missions co-op mode
Defeat Black Manta
Obtain A Grades in half of the Missions
Buy half of the enhancements
Complete 1 challenge
Defeat Bane
Get half the Dioramas
Reach level 20
Collect half of the Alternate Costumes
Defeat Icicle Jr and Sportmaster
Complete 5 missions co-op mode
Defeat 500 enemies
Defeat Killer Frost
Destroy 350 objects
Reach level 10
Defeat 200 enemies
Defeat Sportmaster
Complete 1 mission co-op mode
Defeat Cheshire
Defeat the first 15 enemies
Reach a Score of 5000 in the YJT
Answer 5 Young Justice Trivia questions correctly in a row
Reach a Score of 500 in the YJT
Reach a Score of 1000 in the YJT