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