Watchmen The End is Nigh

Ok, there are two methods of doing this... (both of which are done easiest on Chapter 1)

[First Method]: If you have two controllers, then this is clearly the easier method. I'd recommend going for this when you go for beating the game on co-op. But if you do it by yourself or with a friend, it doesn't matter. Simply chill back with whoever you want the achievement for; actually to make it easier, whenever there is a new spawn location or your character is near any sort of possible damage that could be inflicted, run clear the other way. When your guy is back use the other one to attack and clear out the whole level. The only time you have to move your guy forward is after your buddy has cleared the area and you need to lift a gate/go under the gate or pull levers. Also watch out for fire, I avoided it completely and I'd advise you do the same if you want this achievement.

[Second Method]: If you only have one controller, then the method that can't fail you is using Counter Attacks throughout the Chapter. To perform a Counter Attack, press RB + X. (Also be sure to have played Chapter 1 already to have this move unlocked). When you play this level, simply mash RB + X simultaneously over and over and over again until the end. DON'T STRAY AWAY FROM THIS METHOD!! I tried attacking guys one-on-one later in the Chapter thinking it would be okay, but at some point, I can guarantee you'll get Counter Attacked yourself which might lead you to throw your controller at a valuable object in your room... So yeah avoid doing ANYTHING ELSE that isn't pressing RB + X if you want this achievement.

P.S. If your guy is rolling away, you can aim him forward so he rolls back into the fight and I did this and didn't get harmed.

Good Luck!!

-Also note that if you get hit, you should exit the game (to the Main Menu) rather than choosing to replay the chapter. I did it this way as it wasn't specified anywhere that if you were to replay the chapter, would you still get the Achievement...