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