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