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