Here is the full list of all 25 Royal Heroes achievements.
Warp a few times
Collect the whole set
Clear a whole other dimension. Get Warping Power increase.
Find and kill all of famous vampires
Discover all earth spells
Sacrifice a weak one to make your army stronger
Veni Vidi Vici!
Discover all water spells
Discover all void spells
Come to dark side. We have cookies. And extra spell slot.
Discover all fire spells
Craft a weapon that only the worthy can wield
Find and restore a famous weapon. Get Warping Power increase.
Find and 'pet' at least 10 sheep
Discover all air spells
Hire a 4 star hero
Flawless victory - no casualties
Do something useful. DOIT!
You can't be a winner all the time
Dont be a Batman - do it!