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