Here is the full list of all 41 Bound By Flame achievements.
Upgrade a skill
Vanquish 25 enemies
Vanquish a Juggernaut
Vanquish a Deadwalker General.
Vanquish a Concubine
Vanquish Lord Blackfrost
Become the most powerful being on Vertiel
Purify Vertiel by bathing it in flame
Use the energy of the Worldheart to annihilate the Ice lords and save Vertiel
Accomplish your transformation by following the demon's way
Preserve your humanity
Accomplish 20 side quests
Seduce Edwen
Seduce Rhelmar
Seduce Sybil
Seduce Randval
Accomplish all of Sybil's personal quests
Accomplish all of Rhelmar's personal quests
Accomplish all of Randval's personal quests
Accomplish all of Edwen's personal quests
Complete Bound by Flame in the Hawk difficulty mode
Complete Bound by Flame in the Buffalo difficulty mode
Complete Bound by Flame in the Captain difficulty mode
Vanquish 75 enemies
Vanquish 150 enemies
Fire 50 crossbow bolts
Kill 50 enemies with daggers
Kill 50 enemies with a warhammer
Kill 50 enemies with a sword
Kill 50 enemies with an axe
Set 20 traps and have them sprung
Set your enemies aflame 50 times
Loot 20 chests
Recycle 30 objects
Make 100 objects (potions, booby-traps and munitions)
Make 5 improvements to your weapons and armour
Search 50 fallen enemies
Poison your enemies 50 times
Unlock all the the Warrior skills and their upgrades
Unlock all of the skills of a Ranger and their upgrades
Unlock all the Pyromancer specialization skills and their upgrades