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