II'll not call it personal challenge, but unbearable OCDs :
1) i want to craft and use everything that's possible in vanilla. So always picking an engineer (Only profession who can craft all the bombs) with the smoker trait and never ever an outdoorsman (useful towels and antibiotics).
I craft every mattress, gardening spray and electronic stuff that I can.
2)I try to never kill Z on the road if I can, and take my time to put them on the pavement if i can't.
I also pick up every objects on corpses, cos' nothing belong to the deads. So i always end with a crate full of pens, joalleries and tote bags.
3) I'm always entirely building my base near a lake or a river. And try to possess one of each pickable items of the game.
I also try to get every professional cars that I found.
4)every pumping station on the map are set up with a full generator and a homemade HAM radio.
Please, don't judge me...