Here is the full list of all 13 Legends of Amberland: The Forgotten Crown achievements.
Become disciples of all five masters.
Win the game (any difficulty).
Win the game on Hard or Insane difficulty.
Win the game in half a year (182 days).
Win the game without calling a griffin.
Reach level 50 (any character).
Get approval of all members of the Wizard's Council.
Find the Green Orb.
Learn the Secret of the Enchanted Forest.
Find the Blue Orb.
Find the Red Orb.
Travel 2,000 squares by sea.
Slayed a dragon (any).