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