Here is the full list of all 22 Death Crown achievements.
Pass tutorial.
Beat the Сube.
Beat the Tower.
Beat the Pyramid.
Beat the Blacksmith.
Beat the king.
Defeat all bosses.
Fully upgrade the citadel.
Fully upgrade mine.
Fully upgrade crypt.
Fully upgrade tower.
Complete all missions.
Play PvP.
Beat 10 missions in the Domination mode.
Beat 20 missions in the Domination mode.
Beat 30 missions in the Domination mode.
Beat the Tree.
Beat the Sphere.
Beat the Worm.
Beat the Black Citadel.
Complete all missions in Human Campaign.