Here is the full list of all 12 Castle Story achievements.
Win the Conquest Lights Out preset.
Build 1000 bricks.
Reach wave 60 of Invasion.
Reach wave 30 of Invasion.
Reach wave 15 of Invasion.
Defeat a Warlock!
Build 100 bricks.
Defeat a Biftron!
Build your first brick.
Spawn Bougre.
Build 10000 bricks.
Build 100000 bricks.