Deus Ex: Mankind Divided
64 Achievements
100-120h
Knock Knock
Get Slaw to open the security door within the Palisade Blade. Details for this achievement will be revealed once unlocked
2.4%
How to unlock the Knock Knock achievement in Deus Ex: Mankind Divided - Definitive Guide
Obviously, do NOT kill or use a take-down on Slaw when you first meet him very early in the DLC.
Later, once you are in the Palisade Blade-01, make your way to the second floor of the facility. You will want to reach a part of the map labeled, "WEST MAINTENANCE CORRIDOR 2F". The screenshot below shows my character's location where precisely you will want to navigate towards:
There are a few ways to reach this area, but the simplest and quickest is to walk/stealth over to the double doors marked "WEST CORRIDOR - Maintenance and Utilities" after arriving on Level 2 through normal progression.
Provided you didn't kill or take-down Slaw earlier in the game, he will be found here and after a cutscene is triggered with Adam speaking with him, the achievement will unlock:
Feel free to oblige Slaw's request to knock him out after he unlocks the nearby security door and camera.
(Missable!)
The same guy who gave you the pass-port card in the pub will return to the Palisade Blade once you're in it. To meet him, go to the 2nd floor west maintenance corridor, he will be standing there. Complete his dialogue to get his trophy.
Once you have made your way into the bellows of the Blade, you will emerge from the elevator and be thrown into a colossal, multi-leveled chamber.
Slaw is located on Level 2, specifically in the West Maintenance Corridor. He is wearing a white jumpsuit and can be approached directly since there are no other enemies around his position. Speak with him and he will happily open the security door for you, thus unlocking the achievement.
PS: At the same time you will take a shortcut!