Here is the full list of all 25 Royal Heroes achievements.
Clear a whole other dimension. Get Warping Power increase.
Discover all void spells
Discover all air spells
Veni Vidi Vici!
Discover all water spells
Discover all earth spells
Find and 'pet' at least 10 sheep
Find and kill all of famous vampires
Discover all fire 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!
Warp a few times
Find and restore a famous weapon. Get Warping Power increase.
Sacrifice a weak one to make your army stronger
Collect the whole set
Craft a weapon that only the worthy can wield
Come to dark side. We have cookies. And extra spell slot.