Here is the full list of all 21 Dark Rising achievements.
Win all the "Floating World" levels.
Win the first "Depths of the Abyss" level.
Win the game.
Painstakingly killed 25,000 Enemies
Gain 500,000 score to spend on upgrading your castle.
Win the first "Swamp" level.
Kill 100 enemies using traps.
Kill 2,000 enemies using pledges.
Train 50 pledges.
Kill 500 "Giant Ravens".
Kill 250 "Spiders"
Kill 5,000 enemies using your castle's defenses.
Killed 1,000 Enemies
Lose 100 buildings/pledges.
Gain 100,000 score to spend on upgrading your castle.
Kill the feared "Lava Golem"
Kill 2,500 enemies using outposts, towers, and catapults.
Purchase 50 weapons or armor from the blacksmith.
Kill 250 "Ghosts"
Killed 250 Enemies
Lose 10 buildings/pledges.