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