Death's Door

There are a total of 50 life seeds and an associated pot (for a total of 100 collectibles needed for this achievement) for each one throughout the game that provide the healing mechanic as you play. Following the video guide below will be the most painless way of making sure you find every seed and pot as you go, though there is a helpful but time-consuming way to clean this up post-game. After accessing the secret garden referenced in Plot Head (25G) you will find the shiny thing "Rusty Garden Trowel" which, when the world is night, will glow in your menu if there are seeds still to be found in the area. At the same time Pothead, who will also be in the garden, will tell you the rough location of a pot without a seed, although he will only tell you one-at-a-time which depending on how many you missed will require multiple trips back to the Estate of the Urn Witch to talk to him.