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