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