Your Sibling's Keeper Achievement

[FairyGodfeather]

@surield

but I can’t kill her no matter what method I choose.

Sibling’s keeper is not you killing her, it’s her killing you, and it happens later in the game, near the end if I remember.

Hrm maybe not.

@FairyGodfeather

I’m picking through the code for the achievement. It looks like it’s under two options.

#Poison a carafe in their rooms and then keep ${Mateo} and Rosa away.
#Poison a carafe in their rooms and then keep ${Mateo} away.

It seems like there’s a random check there, with a 1 in 4 chance you’ll kill your sibling.

So! From the looks of it it’s really, really annoying achievement to get. You have a 1 in 4 chance based on a random roll. So you just need to keep playing it over and over again until you get lucky with the random number generator. (It used to be you could go back and forth from the stats page to force a reroll, I can’t recall if you can do that now though.)