[PS3] Dragon Age: Inquisition - Problem with Demonslayer/Invincible

Anyone? My game was very unstable and quite a few times system froze, and won't answer w/o hard reboot. I've heard a couple of stories that these crashes destroys user progress with some achievments, yesterday i've got Demonslayer after a few days farming demons in Hissing Wastes.

So i've got to farm 1500 enemies more, after 2 full playthroughs? Only negative memories after this bugged to death game  :<

System PS3.

I have seen a lot of forums not completely answering this. In short I believe your main character has to be the one to kill the enemies and demons for these 2 trophies to pop, it does work across multiple playthroughs and so I completed them by starting or loading an easy rift and not taking any companions with me. It seems if you die while fighting demons they do count towards the trophy though, so reloading old saves is not an issue. I have seen lots of replies that assume if you get the 75 rift trophy you will easily get this one. I have played on nm and completed every area and rift including hakkon dlc and not got trophy but it will pop eventually. I know the dragon one is a bit buggy and usually needs 2 playthroughs so this may be the same. I wish you luck.