From InquisitionWiki

The peasant class defines those with few or no rights under the law. They are generally poor tenants, and given no opportunities in life. Their toil feeds the rich, and while they are the foundation upon which society thrives, they reap very few rewards for their work.

Peasant Professions

Baker      : made and sold baked goods such as bread, cakes and pastries.
Bailiff    : allotted jobs to & repaired buildings/tools used by peasants.
Barber     : cut hair. Also served as dentists, surgeons & blood-letters.
Bottler    : in charge of the bottlery.
Brewer     : made alcoholic beverages such as beer, ale and mead.
Brickmaker : made bricks from various materials for use in building.
Butcher    : dressed meat for market.
Butler     : cared for the cellar, oversaw drink-related staff.
Carpenter  : built flooring, roofing, furniture, scaffolding, etc.
Carter     : brought wood and stone to a construction site.
Cobbler    : repaired shoes.
Cook       : roasted, broiled, and baked food in the fireplaces and ovens.
Cottar     : did the odd jobs no one else wanted (swineherd, etc.)
Ditcher    : dug moats, vaults, foundations and mines.
Ewerer     : brought and heated water for the nobles.
Farmer     : worked the land or raised animals for consumption or trade.
Fishmonger : earned a living by selling fish.
Gravedigger: earned a living by digging graves.
Groom      : cared for the horses in a stable.
Herdsman   : tended to livestock.
Laundress  : took on washing for households, for coin.
Miller     : worked in a mill, making flour from grain.
Miner      : worked in a mine, extracting metals or gems from the earth
Painter    : paid to paint buildings and other things.
Plaster    : applied plaster for a living.
Potter     : made practical or ornamental things from clay.
Sailor     : worked on a ship.
Sapper     : an unskilled person who dug a mine or approach tunnel.
Scullion   : responsible for washing and cleaning in the kitchen.
Spinster   : a name given to a woman who earned her living spinning yarn.
Thatcher   : made roofs from different plant materials.

NOTE: These are common professions for the peasant class, but they are not restricted to that class alone.