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