Here is the full list of all 19 WWE Legends of WrestleMania achievements worth 1,000 gamerscore.
Win a match using a manager in an Exhibition match
Become a Legend Killer in Legend Killer Mode in 30 minutes or less
Defeat 10 opponents with a Created Legend in a single tier in Legend Killer Mode
Obtain a medal in Legend Killer Mode
Have your Created Legend reach the Top rank in Hall of Fame Mode
Successfully perform a dive attack from all four corners
Clear all "Relive" matches in WrestleMania Tour Mode
Make a Created Legend
Complete any match without pausing in the "Relive" section of WrestleMania Tour Mode
Obtain a medal in WrestleMania Tour Mode
Win a match using a Chain Struggle
Win a match using a Tag Chain Struggle
Win a match using only grapple attacks
Win by using five or more reversals in a single match
Win a 30-Man Royal Rumble
Obtain all of the medals in WrestleMania Tour Mode
Obtain all of the medals in Legend Killer Mode
Max out a Created Legend's attributes
Defeat the Favorite Legends Tier in Legend Killer Mode