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