I'm not an achievement hunter, I just play, so I'm totally that person. I have many hundred hours in XCOM, and I somehow got some really basic achievements yesterday just by chance because I did something different.

Some rare achievements are just funny. One of the rarest ones I have on Steam (3% of players have) is to play the credits which can be accessed from the settings on Blazblue Cross Tag Battle.

I was thinking how in games where you can date people, you can see which characters are less loved (or added more recently) by how far down they are.

Achievements sometimes just don't register (e.g. when playing a game with mods). I've been playing Factorio for many years and still don't have most of the achievements despite having hit those milestones.

If I recall correctly Return of the Obra Dinn has one for blaming the Captain for every single death (arguably true if we're being argumentative, but I can't give that bastard Nicholls a free pass), which admittedly takes some effort, as you still have to play the whole game (which is great on a first or even second time, not so much on an nth time just for the achievement).