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