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