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