Here is the full list of all 8 You Will (Not) Remain achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Play fetch for the last time.
Drink a whole lot of coffee.
Water your plant and water you soul.
Listen to the first radio message.
Find Lambshank.
Neglect your plant like you neglect yourself.
Spend some time relaxing on the balcony.
Interact with the front door after Lambshank drags you away.