Here is the full list of all 55 Rusty's Retirement achievements. It takes around 120-150 hours to unlock all of the achievements on Windows.
Earn 10 MILLION spare parts across all farms
Place down ten pigs on one farm
Unlock the Desert Oasis farm
Unlock the Blossom Forest farm
Harvest 250,000 crops (across all farms)
Place down ten cows on one farm
Move a building at least once
Unlock the Sandy Desert farm
Build 666 crop tiles on a single farm
Unlock all crops
Water 1 MILLION crops (across all farms)
Max upgrade a Waste Bot
Produce 1 MILLION biofuel across all farms
Build on every available tile
Place 100 decorations on a single farm
Unlock all berries
Grow a Giant Cucumber
Max upgrade a Fertilizer Bot
Max upgrade a Water Bot
Max upgrade a Berry Bot
Max upgrade a Harvest Bot
Play the game for 48 hour (across all farms)
Unlock 25 crops
Build 10 Biofuel Converters on a single farm
Grow a Giant Tomato
Place 10 Bulb Hives on a single farm
Earn 1 MILLION spare parts across all farms
Collect 1,000 animal waste
Max upgrade a Feeder Bot
Max upgrade a Biofuel Bot
Unlock the Flower Swamp farm
Deploy one of each robot on a single farm
Place 25 decorations on a single farm
Earn 250,000 spare parts across all farms
Produce 100,000 biofuel across all farms
Grow a Giant Pumpkin
Build Splunk's House
Build Slate's Barn
Produce 25,000 biofuel across all farms
Play the game for 24 hour (across all farms)
Place at least one decoration
Earn 50,000 spare parts across all farms
Build Echo's Workshop
Produce 5,000 biofuel across all farms
Build Forbic's House
Unlock 10 crops
Earn 15,000 spare parts across all farms
Build Pinion's House
Build Sonnet's Shop
Build Haiku's House
Produce 1,000 biofuel across all farms
Play the game for 1 hour
Unlock a new crop
Spin the Cog a thousand times
Spin the cog once