This is the challenge in Attack of the Saints where you have to kill all Agency NPCs in the entire chapter without being spotted. There are 3 "Secret" check boxes shown in the description. Many had struggled with it claiming it bugged, then some started saying it was doable (after claiming to have beaten it) if you A) don't rasie "Suspicion", B) no bodies are found, and C) don't use any checkpoints. Thus, I assumed those were the 3 secrets.
Problem is, I HAVE taken my time and carefully satisfied all those criteria, killing everyone with garrote, and still, it says I've not beaten it. I've not been spotted by anyone, Agency or civilian, no suspicion has been raised, no bodies found, and I haven't even reloaded auto checkpoints, let alone player ones. I even made sure I started from the first playable part crawling out of the burned vent, vs loading the first checkpoint like some do.
The only thing I thought it might be is there's always one guard in the Cornfield part of that chapter that talks about the first Saints team having been discovered dead. I assumed that was just a scripted dilogue that always plays even when no bodies are found though. As far as I know there aren't even enough containers to hide all 13 bodies in the Parking part of that chapter anyway.
Has anyone here successfully completed this challenge on PC? Is there something I'm missing? I have looked at lots of videos and read tons of chat on this, and I can't for the life of me understand why it's not unlocking.