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