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