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