Looking at my PS4 Trophies I see that I have two fairly rare ones which I achieved without trying or even being aware of, but also doubt I could duplicate again.
What's the rarest achievement you stumbled into?
Both of these seem to be sub-5% on PS4 at least.,
UC4 - first (and only) playthrough
Just Floor It! - Drive away in the jeep with Elena without killing any enemies
Overwatch
Minesweeper (Winston) - Destroy 10 turrets or traps using Winston's Tesla Cannon without dying in Quick or Competitive Play.
What's the rarest achievement you stumbled into?
Both of these seem to be sub-5% on PS4 at least.,
UC4 - first (and only) playthrough
Just Floor It! - Drive away in the jeep with Elena without killing any enemies
Overwatch
Minesweeper (Winston) - Destroy 10 turrets or traps using Winston's Tesla Cannon without dying in Quick or Competitive Play.