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