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