Here is the full list of all 44 The Book of Legends achievements.
Complete RPG Mode
Kill Cassandra
Complete 6 or more quests
Recruit Luis
Kill Jar-Gayr
Reach the highest level in the Tower of Ancients
Kill the Demon of Tricks for real
Kill the Demon of Tricks
Recruit Nagam
Check 10 or more opened chests
Kill the Demon of War
Kill 100 or more enemies with bears
Kill the Demons of Pride 'n' Luxury
Kill all the Balaz cats in the Majestic Hotel before killing both demons
Kill the Demon of Ego
Open 60 Chests
Complete a quest
Use Jordan's Balance of Power 30 or more times
Find Yu
Use Jordan's vision 20 times or more
Kill the Demon of Fear
Ambush 10 or more enemy parties
Pick Jasmine over Melusine
Keep Jasmine alive
Play for an hour or more
Finish the game in less than 20 hours
Play for 50 hours or more
Complete all quests
Obtain 100,000 gold or more
Make Jordan kill 1000 or more enemies
Go through 2000 or more fights
Obtain 999,999 gold
Reach level 50 with Hans
Find Teksab
Kill the spider in Tower of Ascension
Succeed in the Colyseum 10 or more times
Never use go through until the game is completed
Hold 12 or more Gigaconda skins at the same time
Find the Heart of Fire in the Temple of the Great Sleeper
Hold 6 or more Carbocoates
Find Flash Ring in opened chest
Marry Jasmine
Marry Melusine
Kill 200 or more enemies with tigers