I'm still confused on how to get the "I know you" acheivement

[Tengen Toppa]

We're meant to correctly banish the demon before embalming 3 bodies, however failing to embalm all 3 bodies always resulted in me getting the pseudo-ending where Raymond locks me up in the basement whilst I'm NOT possessed (i.e I call him mr. Delver and don't go all maniacal and demonic on him)
It's as if he's annoyed by me that I skipped part of my job as his assistant haha.

[Sovereign Dark]

That means you'd burned the wrong body/gotten the demon wrong. I Know You can be a difficult achievement even if you've gone through multiple shifts. Sometimes the bodies will show obvious signs or the demon will put Rebecca into a fugue-like state in which she may catch a glimpse of the demon's House. That's if you get lucky. The best way to determine the right demon is by PoE once you've seen at least two symbols (you can guess the third with enough information). The correct body is a bit more elusive at times. Keep trying. You can have a 'look' at all of the bodies, then return them to cold storage. When you see obvious signs on a body, try to collect enough info to determine the correct demon without embalming all three.

Also, sometimes you'll find the demon's House but see that more than one in that House matches two symbols you've located. In this case, you'll almost always have to embalm all bodies. Try again next shift.

Best of luck and don't worry, you'll get it eventually.

[Tengen Toppa]

I wonder then, what is the lore behind Raymond's behavior?

What reason does he have for locking us up if we are NOT possessed by the end of the night? Regardless if we banished the demon or not, we are still safe, all things considered.

Or, rather the other way around: why when we are possessed, we either act all demonic (maniacal laughter, demon voice etc.), or we are 100% our plain selves ("Mr Delver?" instead of "Raymond?" and pure panic and fear for our lives)

[Banshee Radar]

You need to burn the right body before embalming all three

[Sovereign Dark]

Originally posted by Tengen Toppa:

I wonder then, what is the lore behind Raymond's behavior?

What reason does he have for locking us up if we are NOT possessed by the end of the night? Regardless if we banished the demon or not, we are still safe, all things considered.

Or, rather the other way around: why when we are possessed, we either act all demonic (maniacal laughter, demon voice etc.), or we are 100% our plain selves ("Mr Delver?" instead of "Raymond?" and pure panic and fear for our lives)

That's a good question and point. My take on it is that it depends on how miserably we've failed, ha! That's meaning what and how much we'd done wrong.

Perhaps if our failure is minor, possession does take place but the demon hasn't yet fully manifested and taken over Rebecca's personality. Whereas, if we 'really' mess things up, Rebecca's clearly all demon inside.

In either instance (if I'm to guess any further), Raymond believes he has to lock Rebecca away based off experience with previous assistants who'd manifested demonic possession after failing the same tasks. I think they discuss that at some point.

I don't know for sure but I know I love this game. :)

[Tengen Toppa]

Love this game too :)
Also, I got the achievement today! First body practicaly all but explicitly told me it's "the one". Burned it before even looking at the other two, and I was right :)