Trophy bug/ secret requierments

[Ravie_HD 28]

I think for the discreet trophy (kill all suspects without alarm it may need to be done without reloading checkpoint. I was doing the last mission today and tried going for the discreet trophy. The first time i tried doing it by blowing up the barrel and killing all 3 at the same time but that did not work. So i tried completly stealthing the area and after reloading checkpoint a few times i got the challenge for killing everyone without alarm (suspects included) but the trophy did not unlock. I restarted and did the challenge again but it did not unlock the trophy. Only after i killed all 3 of them silently without failing and reloading checkpoint did the rophy unlock.