Here is the full list of all 60 Littlewood achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Mine 6000 ores.
Chop 3500 trees.
Chop 6000 trees.
Catch 2500 bugs.
Catch 2500 fish.
Complete 100 quests.
Complete 150 quests.
Donate all items to Museum.
Complete all Personal Goals.
Mine 3500 ores.
Find all Tarott Monster cards.
Discover All Tavern Recipes.
Gather 4000 items.
Harvest 4000 crops.
Craft 2500 items.
Visit the Edge of Solemn.
Unlock all town wishes.
Harvest 2500 crops.
Gather 2500 items.
Unlock all ultimate upgrades at the Crafting Workshop.
Get Married.
Upgrade all structures and areas to 10 stars.
Sell 1500 items.
Catch 1000 fish.
Harvest 1000 crops.
Catch 1000 bugs.
Gather 1000 items.
Adopt a pet.
Complete 50 quests.
Catch 500 fish.
Mine 1500 ores.
Chop 1500 trees.
Catch 500 bugs.
Catch 250 fish.
Meet 15 Townsfolk.
Sell 700 items.
Craft 1000 items.
Harvest 500 crops.
Gather 500 items.
Complete 25 quests.
Chop 750 trees.
Mine 750 ores.
Catch 250 bugs.
Craft 500 items.
Sell 300 items.
Complete 10 quests.
Catch 100 fish.
Catch 100 bugs.
Harvest 100 crops.
Meet 12 Townsfolk.
Craft 250 items.
Meet 10 Townsfolk.
Gather 100 items.
Sell 50 items.
Sell 100 items.
Chop 150 trees.
Craft 100 items.
Mine 150 ores.
Meet 5 Townsfolk.
Meet 3 Townsfolk.