Towards the ending of Chapter 5
Go back to the camp and talk to Esther.
Can you remember the tune that Timmy likes to whistle?
Use the Go into the wood exit in the background.
Combine the tasty sausage and the thin wooden stick.
Use the sausage on a stick as bait.
Use the flute on Timmy.
From left to right, play the flute holes in this order: 1, 5, 4, 3, 2, 1
Achievement will unlock during the short scene