OMG I was missing the lighthouse one, I assumed I had missed Ugsome Storr and redid it, found nothing, grrr tried three bastards, but gave up in frustration, thought I may as well start from scratch, the mermaids disappear when you get them, I thought I might need to do something with my video card drivers LOL finally got it.

@Maldito I'm pretty sure some NPCs mentioned about them 2 or 3 times. I think the point of their existence is just for achievement but who knows

Is there any point in collecting them? Does any NPC hints at their existence at any point?

Thamk you

for number 7 its the rock that is the hardest to see out of all of them. :)

For Ugsome Storr at the starting location. You can barely see 4 tiny rocks sticking out of the sea to the your right as you look at the mountain.
The mermaid is in on the furthest one, one to the right from the left most rock.

goat

+rep good guide

tip: put your reticle on them

ty