Hello there! I already posted how to get that achievement in the older threads but I'm just gonna copy-paste it here so you don't need to backread.
For "Don't Play Nice with the Kindred" achievement - choose all bad choices in Vox's route. If you need specific choices, pick these when meeting the kindred for the 1st time:
- Uhm... is that how you speak to your boss?
- No thanks
- Reject
- We all care about you
- (Go back to eat)
- (Confront him)
- (Go inside)
- I'd rather be alone
- (Ask)
- Nothing happened
Hope this helps!