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