Whammied achievement not registered

[Kistencrayle]

I had a game where I believe I fulfilled the requirements of the "Whammied" achievement but didn't receive it. Unless it means kill 5 people in one night? Though other achievements that require it to be all in one night say that.

Screenshot of game -

https://imgur.com/CnwHLby

Screenshot of achievement -

https://imgur.com/2QJc6NM

I also have a video showing that all the hexed people were killed by me, the Hex Master. I actually killed one of them twice but I'm not sure if that's relevant.

Just trying to understand if this is a bug or if I'm just misunderstanding the requirements of the achievement.

[Jerme]

It could be that the "Hex bomb" is meant with that, which would unleash a powerful attack to all living non Coven members, if they all were hexed.
But I am not fully sure about this.