Paradise Killer

Two parts really, acquire then deploy. In order to find the pile bunker gauntlets, you will need to have progressed a fair way into the game and have all of the Nightmare Computer Hacking Upgrade things for Starlight. Once you do, investigate the back side of Sam's Bar Knife Through the Heart Bar. (the fast travel is Citizen Housing>Sam's Bar) There is a video investigation scene with 2 hackables. The one on the left contains your Pile Bunker Gauntlets (stolen, 1 charge). The one on the right contains an important chunk of evidence. Back out after completing the hacks to pocket both items.

In order to use the Pile Bunker Gauntlets, Fast Travel back to the Syndicate Graveyard point where One Last Kiss hangs out. Turn right and hop over the bench and walk towards the pyramid in the distance where you meet a god and keep an eye on the cliff at your feet. There is a strange patch of pink ground that you can activate here and you will pull out the gauntlets and smash the ground open to reveal a hidden vault with some pretty key lore that I won't spoil.

Here is a guide for 11 miscellaneous achievements around Paradise Killer, with this one being the tenth one.

Ssj's guide is fantastic, I've just provided a video guide if it helps!