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