Crackdown 3: Wrecking Zone

Okay, so this obviously requires a small amount of luck. But here is how I got it.

I did not completely avoid combat, I ended up 6 and 0. In agent hunter, use the Overshield as your equipment. Now in game, continue to move around only fighting to defend yourself and evade. If you see a white line, someone is targeting you. If an opponent surprises you, and you are attacked, try to run the enemy into a fellow teammate while using as much cover to save your butt.

Hopefully you have a good team that will be able to save you. While it's difficult, it's not impossible.

Opposite of what I've seen recommended, I suggest getting to the lowest point possible in the map and hiding. Buildings can be collapsed and draw you back into a fight you don't want to risk running away from. Some levels have jump pads around the pit of the map that don't see much activity and you can easily navigate around the island from down there in case enemies happen to get too close.

Territories is also recommended as the game type because more players will be focused on those spots, so there's less interest in spotting players off the beaten path. Doing this in a game where your team has fewer player will likely help the match end sooner, which improves your odds of not being accidentally discovered.

I've now done this both in 'Hidden' and 'Dangerous' fashion and would like to point out some tips to do both

If you're going for 'Hidden,' it'll require just a touch of luck but isn't challenging whatsoever. Simply use the vertical boost and get to the highest point you can that's also far from the center of combat. Other players don't look that high, nor do they care to avoid all the other combat happening nearby to go out of their way to engage you. A shield won't help you much for this achievement as once someone's got the jump on you it gets difficult to safely maneuver your way out of the situation. Additionally, just one bad jump, dash, or roll with a shield could result in you dropping down to where much more action is happening.

If you're going for 'Dangerous,' I'd still recommend using a vertical booster again, although you're also going to want the shotgun and your favorite launcher (homing launcher for me). At this point, the focus is on being on the move and extremely agile the entire time. If you hit the enemy with a single homing launcher round followed by the 2 shotgun shells at close range, it will kill them immediately and keep you on the move. The next BIG focus is your special ability, which you can quickly get by collecting the orange orbs around the map (I believe it's 25% for each one) and press RB + LB to use. The super will both immediately begin healing you back to full health as well as allow you to reload faster so you're much more combat effective. Using this playstyle, I've now had a 10-0, 8-0, and 7-0 in just a handful of games, all of which were fully populated lobbies where I was engaging everyone possible

Whichever method you choose, the achievement will pop when the match concludes and the stats are shown. Best of luck to all and hope this helps!