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.
Complete 150 quests.
Catch 2500 fish.
Gather 4000 items.
Mine 6000 ores.
Catch 2500 bugs.
Get Married.
Find all Tarott Monster cards.
Harvest 4000 crops.
Mine 3500 ores.
Complete all Personal Goals.
Unlock all ultimate upgrades at the Crafting Workshop.
Harvest 2500 crops.
Discover All Tavern Recipes.
Gather 2500 items.
Complete 100 quests.
Chop 6000 trees.
Chop 3500 trees.
Adopt a pet.
Upgrade all structures and areas to 10 stars.
Unlock all town wishes.
Harvest 1000 crops.
Craft 2500 items.
Catch 1000 bugs.
Catch 1000 fish.
Mine 1500 ores.
Chop 1500 trees.
Sell 1500 items.
Gather 1000 items.
Complete 50 quests.
Complete 25 quests.
Catch 500 bugs.
Craft 1000 items.
Chop 750 trees.
Catch 500 fish.
Meet 15 Townsfolk.
Harvest 500 crops.
Mine 750 ores.
Complete 10 quests.
Sell 700 items.
Gather 500 items.
Catch 250 bugs.
Craft 500 items.
Meet 12 Townsfolk.
Catch 250 fish.
Meet 10 Townsfolk.
Sell 300 items.
Catch 100 bugs.
Harvest 100 crops.
Craft 250 items.
Catch 100 fish.
Gather 100 items.
Sell 100 items.
Sell 50 items.
Mine 150 ores.
Craft 100 items.
Chop 150 trees.
Meet 5 Townsfolk.
Meet 3 Townsfolk.