Here is the full list of all 12 Ruined Kingdom achievements.
Complete the game.
Defeat over 500 human enemies.
Get all the upgrade points.
Defeat all enemy commanders.
Summon 1000 orcs to war.
Use the cure more than 1000 times.
Whip over 1000 orcs to war.
Fire over 1000 projectiles at the enemy.
Throw over 1000 spears at enemies.
Defeat the revolt and restore order.