Here is the full list of all 9 Once Upon a Jester achievements.
Unlock all stickers.
Find the fish.
Make the perfect smikkel.
Finish the game!
Steal the Royal Diamond.
Watch Freek get pulled into the sea by the kraken.
Find Pesto.
Play the right tune for all Callers during Jerry Jeremy’s radio show performance.
Pop the frog into popcorn over the campfire.