Here is the full list of all 56 Blade of Darkness achievements.
Complete the game as Sargon, a knight
Watch the credits
Choose to go to the Abbyss and destroy the evil
Complete Abyss level
Kill the Lord of Darkness in the Abyss
Kill Meskalamdug in the Abyss
Kill Chaos Knight in the Abyss
Kill the vampire in the Abyss
Kill lava golem in the Abyss
Kill the iron golems in the Abyss
Complete Tower of Dal Gurak level
Kill Dal Gurak
Kill Meskalamdug
Complete The Temple of Ianna level
Survive an encounter with Chaos Knight
Complete Forge of Xshathra level
Kill lava golem, Guardian of Uri-Sabrig
Complete Temple of Al Farum level
Kill 2 stone golems
Complete The Oasis of Nejeb level
Defeat the vampire for the second time
Complete Fortress of Nemrut level
Kill Guardian of Birr
Complete The Gorge of Orlok level
Complete Shalatuwar Fortress level
KIll Orc cheaftan, his minions and minotaur
Gaze at the map of the Kingdom a little longer
Complete Island of Karum level
Defeat the vampire for the first time
Complete Tombs of Ephyra level
Kill the stone golem
Kill the burning skeleton
Complete Fortress of Tel-Halaf level
Complete Mines of Kelbegen level
Kill The Troll of Kelbegen
Complete Tabriz`s story level
Kill the knight at Tabriz
Survive the first encounter with Chaos Knight for Sargon
Kill the first enemy
Complete a basic controls tutorial
Watch the game's intro till the end
Complete Kashgar, Tukaram`s story level
Complete Kazel Zalam, Naglfar`s story level
Complete Marakamda, Zoe`s story level
Choose not to destroy the evil completely
Kill the Troll of Kazel Zalam
KIll the demon at Marakamda
Complete the game in one run, in 8 hours or less without using saves a single time
Complete the game with the saves rating 'AWESOME!'
Complete the game with the saves rating 'HEROIC'
Complete the game with the saves rating 'BOLD'
Complete the game with the saves rating 'NORMAL'
Complete the game as Tukaram a barbarian
Complete the game as Naglfar, a dwarf
Complete the game as Zoe, an amazon
Kill an enemy with a limb