Here is the full list of all 33 Farm Kitten - there are Puzzle Pipes achievements.
Buy a windmill
Buy a tractor
Buy a truck
Buy a farm house
Buy a wind turbine
Buy a car
Buy a house
Buy a stone path
Buy a chicken coop
Buy a silo
Buy a tractor carriage
Buy a shrub
Buy a scarecrow
Buy a sandbox
Buy poles
Buy a mill
Buy the animal fences
Buy a well
Buy hay
Buy a fence for the house
Buy a carriage
Buy a bike
Buy a tree
Buy a timber
Buy grass
Buy a garden
Buy a wheelbarrow
Buy guide post
Buy a dryer
Buy barrels
Buy mail-box
Buy a sunscreen
Buy a ball