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