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