I would love to have a hint, thank you.
Sure thing!
[A] Just play the game regularly.[B] and [D] are doggo related.[C] Related to the man in the cave and how he got there.[E] Related to who you give the wood to.
Just so you know, the ones I've found were: the peeing dog, crossing the river in the early game, and finally raining on the fire.
Then you found the original three endings and are still missing D and E :)