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