Story achievement
Convince th pig at the farm to be te martyr for your religion.
For that you need to convince him that the barn is the head of our god, so:
Open the windows
Press the orange button on the wall 3 times.
Stop the lever on the basement when the A1, A2, B1, B8 light are lit. For this one you need the bucket (butcher shop) and the rope (barn basement), use the rope then the bucket on the farm's well, then hang that on the lever and wait until the lights are lit to take it out.
Finally, give the potion to the pig.