If people try to get achievements on their own or just look everything up before playing the game will already dramatically change the playtime and how people experience the games.
I mean, I probably wasted hundreds of hours to search for COG Tags or Skulls in Gears and Halo alone. But in the end I found every COG TAG on my own.
I'm also a pretty good player in most games and still need more time to finish just because I can even waste time in looking at a chair or vase in a game for some time if it's well made 😆
Pretty sure Barozi is a very good player but also pretty sure there's much more usage of achievement guides involved and less searching or trying without guides