During the case Iron Coffin, BEFORE heading into the Backyard Boys Hideout, eavesdrop on the two gang members in front of the entrance.
The correct words to filter out are: Marketplace in Miner’s End, Beggar Informants, Limping brass.
We learn that there’s a guy called Pipe at Miner’s Market. Track objective “Thinning the Ranks” and go to Miner’s Market in the center of Miner’s End.
BEFORE talking to Pipe, you must put on beggar clothes to get the achievement. If you have the wrong outfit the objective will fail and the achievement will be missed!
The outfit: Clothing = Vagabond Rags
Head = Eye Bandage
Accessory = None (default)
Facial Hair = Designer Stubble
Makeup = Black Eye Make-Up
After getting the outfit, go talk to Pipe. Say to him “There is no attack (Easy)”and the Friends in Low Places achievement should unlock after the conversation.
Be sure you got the Police Uniform equipped after that again to get the achievement Lawful Neutral!