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