Here is the full list of all 41 Little King's Story achievements.
Collect 10,000,000 Bol
Collect 50 Paintings
Collect 1,000,000 Bol
Find 50% Treasure
Find 50% Hot Spring
Break 50% obstacle
Execute 50% Kingdom Plan
Pay 2,000,000 Bol for Condolences Solatium
Pay 1,000,000 Bol for Condolences Solatium
Collect 100,000 Bol
Execute 10% Kingdom Plan
Kill 100 Creatures
Clear 50% Quest From Suggestion Box
Collect 10 Paintings
Kill 50 Creatures
Clear 10% Quest From Suggestion Box
Find 10% Treasure
Find 10% Hot Spring
Break 10% obstacle
Pay 200,000 Bol for Condolences Solatium
Clear All Quest From Suggestion Box
Clear All Quest From Princess Apricot
Clear All Quest From Princess Bouquet
Clear All Quest From Princess Spumoni
Clear All Quest From Princess Shizuka
Clear All Quest From Princess Kokomo
Clear All Quest From Princess Ferne
Clear All Quest From Princess Martel
Execute All Kingdom Plan
Find All Treasure
Find All Hot Spring
Collect All Paintings
Break All obstacle
Kill 500 Creatures
Have 10 Children in Your Kingdom
Have 20 Children in Your Kingdom
Have 50 Children in Your Kingdom
Complete the game on Easy difficulty
Complete the game on Normal difficulty
Complete the game on Hard difficulty
Complete the game on Hell difficulty