Here is the full list of all 61 Two Worlds II HD - there are Call of the Tenebrae achievements.
Create a spell (Single Player Campaign)
Solve Leeta's Mystery
Use the Oculus (Single Player Campaign)
Find Spot the Cow
Upgrade a weapon or piece of armor (Single Player Campaign)
Create a potion (Single Player Campaign)
Escape from Castle Vahkmaar
Complete Alsorna Introduction
Complete Chapter I in the Single Player Campaign
Complete Chapter II in the Single Player Campaign
Complete Chapter III in the Single Player Campaign
Completed the Single Player Campaign
Perform a song, hitting 100% of the notes (Single Player Campaign)
Lockpick 50 locks (Single Player Campaign)
Steal from 25 people (Single Player Campaign)
Effectively use Knockdown 30 times (Single Player Campaign)
Effectively use Battle Cry 75 times (Single Player Campaign)
Kill 50 enemies using Multi Arrows (Single Player Campaign)
Kill 30 enemies using Fire Arrow (Single Player Campaign)
Kill 50 enemies with magic (Single Player Campaign)
Summon 50 monsters (Single Player Campaign)
Set 40 traps or bombs (Single Player Campaign)
Kill 20 enemies using Death Strike (Single Player Campaign)
Complete 10 Bulletin Board Quests
Survive the Arena
Complete the Brotherhood Questline
Complete the Mage's Guild Questline
Complete The Thieve's Guild Questline
Complete the Merchant's Guild Questline
Reach Level 20 (Single Player Campaign)
Reach Level 40 (Single Player Campaign)
Explore 25 dungeons (Single Player Campaign)
Collect all 4 Lost Runes: Human, Elven, Dwarven and Orcish (Single Player Campaign)
Complete Chapter I in the Multiplayer Campaign
Complete Chapter II in the Multiplayer Campaign
Complete Chapter III in the Multiplayer Campaign
Complete Chapter IV in the Multiplayer Campaign
Complete Chapter V in the Multiplayer Campaign
Complete Chapter VI in the Multiplayer Campaign
Complete Chapter VII in the Multiplayer Campaign
Win 5 Deathmatches
Win 5 Duels
Win 5 Crystal Capture matches
Build 5 buildings in Village Mode
Build 15 buildings in Village Mode
Confront Mirage
Wake the Army of Golems
Receive the gift of the Scavengers
Slay the Bailiff and his minions
Kill the Basilisk
Finish the Lovers' Conspiracy storyline
Defeat Corr Amarok
Annihilate the Phobias
Complete Pirates of the Flying Fortress
Find your Treasure
Kill 100 enemies with crossbow (Single player campaign)
Reach 100 points of reputation amongst the pirates
Complete 4 new multiplayer adventure maps
Complete Call of the Tenebrae
Complete both storylines of the Wedding Reception quests.
Help both Gillscar and Vanderbilt to win the struggle.