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