i have no idea why, i got a headshot and it came up : Marksman: 10 headshots", in which i was up to almost 350 last time i saw it pop up, i beat the game on hard and started going through it on crushing and it just reset about halfway throught he game for no reason
I believe kill counts reset when you crank the difficulty up. Kill counts need to be completed at the same difficulty as where you started.
The one I keep getting reset is the 75 kills without dying. I keep getting up to 70-72 and end up getting killed by an inescapable grenade.
thats what ive done, ive just done chapter select the entire game, no "new game", so i dont know why it decided to now reset, im just glad it didnt reset my bounties and treasures and mysteries