Here is the full list of all 12 Crackdown 3: Wrecking Zone achievements worth 500 gamerscore.
Won 20 matches
Secured 100 badges in Agent Hunter
Reached 100 kills
Got MVP (Highest Score on Winning Team) in Agent Hunter
Captured 100 Territories
Got MVP (Highest Score on Winning Team) in Territories
Got a kill with every weapon in a single match
Dealt a large amount of damage to buildings in a single match
Got a melee kill
Completed a match without dying
Won a match
Killed an entire team in a single match