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