Here is the full list of all 6 Fox! Hen! Bag! achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Solved the riddle.
The fox ate the hen.
Pressed the cable car button at least 5 times continuously.
Tried flying down the mountain.
Helped the skeleton get down to the bottom of the mountain.
The hen ate the bag of grains.