Here is the full list of all 10 An Assassin in Orlandes achievements.
Find the ultimate ending in Classic Mode
Find all the images in the book
Roll 3 sixes in a single roll
Find the ultimate ending in any mode
Find the best armour
Find the best weapon
Find Kari
Find Eltane's castle
Roll 3 ones in a single roll
Find Medius the Cannibal