Here is the full list of all 49 Demonicon - there are The Dark Eye achievements.
Defeated Azaril
Denied Calandra
Acknowledged father and thereby chosen humanity
Freed father from imprisonment
Killed Cassio and sacrificed her blood
Banished bandits
Taifelel defeated
Led the Fernfielders to their fate
Gave Genla the talisman
Defeated Ghamat and the Plague Maw
10 potions or poisons used
Defeated the Iribaar's Lily and yourself
Cast 200 Gift spells
Killed 10 enemies solely with Ranged Weapons
Suffered the pain of Rondra's prescence
Convicted and killed Falk
Defeated the overpowering Heshthot in the market
Spoken to Borbarad's Council of the Dead
Reached Level 7 in one Adventure talent
Raised an attribute to its maximum
Completed 5 battles without a scratch
Caught the summoner in the Praios temple
Became member of the City Guard
Used 200 combat moves
Achieved a chain of 12 blows and triggered Demonic Fever
Killed Borak the Bruiser
Killed the cannibal in Moloch Mountain
Learned Chain of Blows
Received the Gift in the tutorial
Reached Mastery Rank Four in one talent
Passed a Talent test
Spared the cannibal in Moloch Mountain
Became member of the Kreutzer Cartel
Gave Ulev the talisman
Banished guards
Slept with Calandra
Introduced the Catechism to the New Church
Destroyed the New Church's Catechism
Sacrificed yourself as First Paladin
Sacrificed Calandra as First Paladin
Returned to Moloch Mountain
Achieved a chain of 24 blows
Successfully dodged two hundred times
Played Demonicon through without using a single healing potion
250 potions or poisons used
Acknowledged Seghal and thereby chosen the Gift
Played Demonicon through in Nether Hellish difficulty
Played Demonicon through in Hard difficulty
50 potions or poisons used