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