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