Tickle William's face with the feather — not his feet — until he says stop.
Official in-game clue: "You have a feather! Toes aren't your only victim."
Where: Day 2 Morning, during Waking up William.
Why it gets missed
Feet are what you tickle someone with a feather, and the game lets you do exactly that. It works as a way to wake him, so the scene advances and the achievement does not fire.
The clue names the trap outright: toes aren't your only victim. It is telling you the interaction you already found is not the one being graded.
What to do
- Take the feather.
- Use it on William's face.
- Keep going until he asks you to stop.
Waking William has a second layer
Separately from the tickling, there is a guess-and-read loop: click his hat, ears and tie, and the direction his eyes point tells you which to try next. That is its own interaction and worth doing while you are here.
Day 2's other missable pair
Roasting the coffee is only half the job — grind it too, and the brush belongs on the kitchen portrait rather than the floor.
If you already missed it
Waking him by the feet is what closes it. Waking up William fires, Day 2 Morning ends, and the feather has no further use on him.
William is around for the rest of the game and you interact with him repeatedly — the cigar, the portrait pose, the fish brooch — but none of that re-opens the tickling. A save from before he woke is the only route.
If you are reloading anyway, Serving Mr. Aldous his Favorite Coffee sits in the same block and is lost just as easily, by roasting the beans without grinding them.
Nearby
The full list of hidden achievements, in the order you reach them, is on the triggers page. Going for everything in one run? See 100% completion.
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