Graveyard Keeper

Put ten corpses in the ground, or cremate them.

This will likely come through natural gameplay, since burying bodies in the graveyard with positive white skull ratings boosts your graveyard score and therefore gets you more donations at the church as you continue quests. The only hiccup in the conveyor belt of bodies is when your donkey starts demanding carrots as payment (you can either plant seeds or buy carrots outright, both available from the farm south of the wheat field on the way to the village).