Here is the full list of all 51 Talisman: The Horus Heresy achievements.
Defeat the forces of Signus Prime
Defeat the Emperor
Defeat the Legio Custodies
Defeat the forces at Damocles Spaceport
Use three Strategems in one turn
Defeat the forces of Nikaea
Complete an Infernal Quest
Defeat Horus
Defeat the Favoured of Horus
Survive the Perilous Wastes
Smash through the Naval Blockade at Luna
Complete an Errant Quest
Successfully navigate The Eye of Terror
Complete all of Roboute Guilliman's goals
Complete all of Corvus Corax's goals
Complete all of Vulkan's goals
Complete all of Garviel Loken's goals
Complete all of Alexis Polux's goals
Complete all of Angron's goals
Complete all of Mortarion's goals
Complete all of Ezekyle Abaddon's goals
Complete all of Konrad Curze's goals
Complete all of Kor Phaeron's goals
Successfully navigate through The Maelstrom
Trade a Talisman
Reach level 50
Reach level 100
Complete all of Sigismund's goals
Complete all of Kharn's goals
Complete all of any Praetor's goals
Complete all of Sevatar's goals
Complete all of Artellus Numeon's goals
Complete all of Erebus's goals