I'm not necessarily looking for mega-difficult or obscure or anything to that extent. I just want achievements in games where less than 3% of the playerbase has achieved it. The lower, the better. If you can explain why so few people have it, awesome; I love to read that sort of thing. So let's start this bitch off right with..
Plague Inc. Evolved – The Future Is Bright
"End the game with apes and humans living together peacefully."
NOBODY has this achievement. Literally no one. 0%. I can only assumed that it's either bugged to be unachievable or the means of getting it are so ludicrously implausible that even the most masochistic completionist couldn't be assed to try. As I don't own the game, I can't comment on what might be hard on it besides a few LPs I've seen of folks playing the game, but it's the very first achievement I saw where absolutely zero people had it and it inspired me to make the thread.