What the Butler Saw

What the Butler Saw is an Achievement/Trophy in Batman: Arkham Knight, as part of the Community Challenge Pack DLC.

Obtaining
Complete the Wayne Manor AR Challenge as Batman without taking any damage or using any gadgets.

The best option here is to take out all enemies with Silent Takedowns. Grappling is still allowed, so the player can still access the Vantage Point for Inverted Takedown, or grappelling up to ledges for Ledge Takedowns. The Minigunner is the real issue here, and you want to leave him for last thanks to how easy it is for him to do damage and your lack of options for taking him out. Once everyone else has been eliminated, sneak up behind him and then initiate the Beat Down so he doesn't get a chance to shoot at you.