Below we'll split it up into what's needed for each mission, instead of each building stage.
The Combine Harvester is a traditional 4 step build with 6 items on each step, the Clearers are each made with the same initial base, then a second, debris specific, item alongside.
So sit back, strap in and get building...
Mission One - Hardly Working
You just need to place the Combine Harvester, yay!
Mission Two - Combination Cuisine
Grass Clearer (Stoner Goat)
4 Goat Harnesses - Standard Adult Goats
8 Clearing Rigs - Requested
6 Cutting Reels - Requested
Combine Harvester Stage One
5 Strong Axles - Requested
6 Cross Augers - Requested
10 Tough Ox Shoes - Skulls
8 Long Reins - Soybeans
3 Combine Wheels - Crafted
2 Oxen Yokes - Crafted
Each Wheel requires 4 Large Spokes (Cherry Trees) and 5 Wide Bands (Requested)
Each Oxen Yoke requires 3 Curved Beams (Oak Trees) and 5 Iron U-Bars (Requested)
Mission Three - Fine Farmers
Rock Clearer (Hardnut Goat)
4 Goat Harnesses - Standard Adult Goats
8 Clearing Rigs - Requested
7 Tough Trowels - Requested
Combine Harvester Stage Two
10 Heavy Bolts - Requested
12 Securing Rivets - Requested
15 Head Connectors - Non Sapling Pines
15 Safety Plates - Squash
6 Standard Heads - Crafted
8 Cutter Bars - Crafted
Each Standard Head requires 2 Angle Irons (Green Apple Trees) and 6 Flex Bars (Requested)
Each Cutter Bar requires 2 Metal Teeth (Thorns) and 6 Revolving Reels (Requested)
Mission Four - Moonlight Symphony
Wildflower Clearer (Hippie Goat)
4 Goat Harnesses - Standard Adult Goats
8 Clearing Rigs - Requested
8 Long Tined Rakes - Requested
Combine Harvester Stage Three
10 Helical Rotors - Requested
15 Rotary Screens - Requested
20 Bullwheels - Brass Forges
15 Wheel Belts - Corn
8 Bucket Seats - Crafted
8 Pick Up Heads - Crafted
Each Bucket Seat requires 4 Wide Buckets (Pigs), 6 Round Cushions and 8 Back Plates (Both Requested)
Each Pick Up Head requires 3 Mounting Belts (Cows) and 5 Forked Tines (Requested)
Combine Harvester Stage Four
15 Seat Platforms - Requested
10 Fuzzy Dice - Requested
20 Iron Boilers - Steel Forges
10 Control Levers - Rocks
8 Draper Heads - Crafted
10 Final Touches - Crafted
Each Draper Head requires 4 Woven Belts (Flax), 8 Metal Sprockets and 8 Wide Scoopers (Both Requested)
Each Final Touches requires 4 Finishing Paint (Cranberries), 8 Protective Casings and 7 Pine Air Fresheners (Both Requested)