Here is the full list of all 14 Battle for Blood - there are Epic battles within 30 seconds! achievements.
Clear stage 60
Clear stage 40
Unlock Royal Knights
Unlock Wizard
Unlock Royal Guards
Clear stage 25
Unlock Feudal Knights
Clear stage 10
Unlock Sergeant Swordsmen
Unlock Archers
Unlock Eagle Warrior
Unlock Armoured Swordsmen
Unlock Warlock
Clear stage 1