Hi there TA! So I have recently completed this game in all of about 2-3 hours as suggested on this site.
I did notice there was not a walkthrough and having looked at the forums noticed a thread talking about walkthroughs. I completed the game with no hiccups using the walkthrough on steam aside from this achievement. If you're looking for the walkthrough for the main game here's the link below!
(Thank You "MARKLAR") from Steam
As for "The Fruit" achievement here is my personal guide below
1. Use ladies lamp to interact with owl in tree shooing it away.
2. With boy grab both eggs from nest.
3. Feed red snake the red egg and vice versa feed blue snake the blue egg.
4. Interact with the snakes opening a puzzle.
5. CLICK IN THIS EXACT ORDER!
-Top Left---Top Middle---Bottom Right---Bottom Left---Top Middle---Top Right!
6. Grab dead snake resting against tree.
7. Use ladies lantern twice or until protruding from the center hole in the tree.
8. Use the dead snake with the boy to knock the "GARLIC?" thing of the tree into the snakes mouth.
9. Use the lady to retrieve "The Fruit" also known as "Your Achievement".
Please leave an upvote and comment if this solution helped at all.
I don't really like following along with video guides so figured I'd make this as easy as possible for other readers like myself. Hunt on achievement hunters :)