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