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