Killing the boss in the well does not complete that portion of the journey. Official 3500, PS4
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Were you able to trigger it eventually?
I haven’t gone back yet.
It’s important that you do this alone if possible. I distinctly remember not being able to unlock the achievement because I cleared the serpent-man dungeon in the vulcano on my current home server the first time in the company of other players.
If you’re using thralls be sure you do some amount of damage to the end boss before the thralls kill him. Possibly it’s changed in the meantime but that’s the only way it’s ever worked for me
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Getting credit while not having anyone else along is a coincidence.
When the bosses die, they are supposed to give credit to every player within a certain range of them - whether you participated in the battle or not is irrelevant.
However, at the same time the credit is being awarded, the NPC is deleting itself.
Whether you get credit or not depends which code finishes executing first. It is random.
If you don’t get credit, try again. There is nothing you can do to make it more likely to work.