How to unlock the Legacy Title: Mater of Dread on Oricon in SWTOR.

The Master of Dread is a unique Legacy Title that you can unlock during or after completing the Storyline for the Oricon Daily Area.

To unlock the Achievement: Mastering the Dread, which gives the Legacy Title Unlock to all your characters, you must kill all 8 roaming Champion NPC’s in the Heroic Area at the base of the Dread Fortress.
They can be very time consuming so make sure to set a Companion to Heal role unless you are playing in a Group.
The 8 Champions are:
Kavo Thran
Hekken Brol’top
Jor Nasar
Malora Pradon
Riko Azal
Sorna Taros
Banok Ral
Selgh Kapgohe

There are also 3 special enemies you must kill:

Commander Zaoron: Killed during any of these quests – Eye of Terror / The Hand that Sees / The Tower’s Core.
Elder Subteroth: Killed during any of these quests – Seeds of Dread / Dread Engines.
Bothrium Beast: Killed during any of these quests – Haunted Paradise / Scared Paradise / False Paradise.

All 8 of these Commanders and 3 Special enemies are tracked in your Achievements in the Legacy Window. They can be found under the Daily Area Catergory > Oricon > Daily Bosses.

Killing all of them rewards the Achievement: Mastering the Dread. Your reward is the Legacy Title: Master of Dread.