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