Batman: Return to Arkham - Arkham City

Side Mission: Identity Theft - Achievement Serial Killer;



*This achievement can be done during the story (after Wonder City) or after in freeplay when you beat the Story, you can go back and still get the achievement. It starts when you turn off all the Penguin's communication disruptors. You'll get a optional side mission that will show you the first location on the map. The map will start showing you more of the locations later when you get further into the story like I said after Wonder City you can finish it.

Note: You have to do this and all side quest again on NG+ (New Game Plus) mode to get Perfect Knight - Day 2.

Serial Killer achievement



Victim #1; (0:17)

The Identity Theft side mission can be officially started as soon as you exit the subway following your disabling of Penguin’s third communication disruptor. The first victim can be found just east of the subway exit. This victim’s location will be the only information explicitly given to you by the Batcomputer in regard to this mission.



Victim #2; (1:00)

The second Identity Theft victim only appears after you’ve completed the first main story mission inside the Museum. Look for a small alleyway in the middle of the building north of Ace Chemicals. Scan this victim’s face and the weapon next to him. After a lengthy conversation with Oracle, it’s up to you find the next lead. Head south.



Victim #3; (2:44)

Once again, the next victim will not appear until you progress past a certain point in the game. Finish your time in Wonder City and rescue the infamous new inmate when you get back to street level. Now you are finally free to find the third victim, who is lying in the middle of an alley on the south side of the Ace Chemicals building. As you approach the corpse, Batman should make a remark about finding another victim; if he doesn’t, quit and reload your game.



Interrogation #4; (3:36)

Scan the victims face and the spot of bleach near his body. Follow the trail of bleach to another alley to the northwest, interrogating the inmate you find there. (Sometimes it will be glitched and he won't show to Interrogate he should be in an prison outfit, if he's not there go to the door behind and come back out of restart checkpoint.)



Killers Hideout; (4:11)

An apartment just east of the courthouse. (You wont be able to enter without finding the all the clues) Enter the hideout and listen to the journal on the table to trigger a scene. Hack the console afterward to escape the hideout, completing the mission.