Here are the seven secret achievements you can unlock in the game.
Destiny Defiant (75) – You have defeated Tirnoch, and defied destiny
Destiny Dominated (100) – You have won the game on Hard difficulty
Hero of Mel Senshir (75) – You have defeated the great Balor
No Destiny, All Determination (15) – You have met High King Titarion, and have been confronted with the true scope of your powers
Reborn (10) – You were reborn from the Well of Souls, and have escaped Allestar Tower
Streaker (10) – You spoke to someone while not wearing clothes
Turning the Tide (20) – A ruse has baited Octienne into betraying the necromantic nature of his experiments
Check out my other article for the complete list of achievements in Kingdoms of Amalur: Reckoning.