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