The Great Perhaps

Here is my 100% Achievement guide for The Great Perhaps.

Just over halfway through the game you will come to a greenhouse and meet the botany expert.. An old man.
You have to follow him for a few minutes before he introduces you to his planet, carl. (He cannot hurt you)

Soon enough, he starts walking to the staff only area in the middle of this green house, make sure your in the future here otherwise he tells you you cant come in.

Once down there, follow him again for a few minutes until he does his potion mixing.

Once he returns to Carl, now it is our turn.
So go back to the staff area, downstairs, to the very left is a pinky purple potion, so pick that up and interact with the gold watering can to the right of this room.
Go upstairs and on the immediate left by the stairs is a green bag, pick that up, put it in gold watering can.
Last, a tiny bit to the left of the watering can is another item to pick up.. Again, watering can, then pick up the can, take it to Carl, achievement unlocked.!

Go to 29:20 to see how and where this unlocks.

Hope this helps!

In the greenhouse, you need to mix a formula for Carl, the giant plant. (Don't worry, he won't eat you.)

Go to the basement, pick up some from the purple flask to the far left, and put it into the gold watering can. Then go upstairs and take some from the green box next to the stairs. Put it into the can. Finally, take some from the bag at the bottom on the floor next to the stairs, and again into the can. Take the can upstairs and feed Carl.

Achievement!