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.
Neglect your plant like you neglect yourself.
Play fetch for the last time.
Interact with the front door after Lambshank drags you away.
Drink a whole lot of coffee.
Water your plant and water you soul.
Listen to the first radio message.
Spend some time relaxing on the balcony.
Find Lambshank.