Here is the full list of all 18 Blinding Dark achievements.
Collected the Blessed Revolver
Your enemy lies broken and lifeless.
Can wait
Collected the Scrying Crystal
Collected the Torch Carrier
The story begins...
Confused and still shacking you begin exploring.
Unlocked all 20 journal entries
Play through ACT I
Defeated 20 enemies
Collected the Ritualistic Axe
Collected the Egyptian Trap
Collected the Svalinn Skjoldur
Collected the Ardens Ira
Your twin... evil twin
Collected at least 50 mana
Collected at least 333 Souls
Collected the Soul Shard