Credit to YouTube channel: Clubby Zamora
This is the guide I used to get this achievement and the "Speedrun" achievement for finishing the game in under an hour. This guide is great because the player doesn't do any glitches or hard tricks. They just play through the game very quickly avoiding all health pickups. I followed this guide and was able to finish the game in about 54~ minutes so there is room for error.NOTE:
When you pause the game/look at the map the timer does keep running which is REALLY annoying. If I ever died or felt like I was taking too long I would dashboard and reload the game so my timer would reset to my last autosave. It's especially important to dashboard when you die because if you don't the game will load your last checkpoint with your current time (it won't revert the time back).
Overall, it isn't too bad of an achievement. Just a bit stressful and annoying one. Good luck and happy hunting!