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