There are 21 unique legacy titles associated with the Player vs. Player content. These season titles cannot be obtained if you missed them during the season.
Arena Legend is obtained from completing "Arena Legend" achievement.
Batten Down the Hatches was obtained from completing "PvP Season Five Prodigy" achievement.
Cartel Combat Champion was obtained from completing "PvP Season One Prodigy" achievement.
Champion of the Wild was obtained from completing "PvP Season Eight Prodigy" achievement.
Honorary Prospect was obtained from the "Season 1: Cartel Combat Championship" reward track.
Immovable Object was obtained from the "Season 3: Reign of Glory" reward track.
Manhunter is obtained from completing "I Am Death Incarnate" achievement.
Mark of the Assassin was obtained from the "Season 2: Piercing the Veil" reward track.
No Quarter Given was obtained from completing "PvP Season Four Prodigy" achievement.
Party Crasher is obtained from completing "This Party's Over" achievement.
Pathfinder was obtained from the "Season 7: Path to Mastery" reward track.
Pirate of Pirates was obtained from completing "PvP Season Six Prodigy" achievement.
Privateer was obtained from the "Season 6: Great Pirate Hunt" reward track.
Ruthless Warlord was obtained from the "Season 5: Pirate’s Plunder" reward track.
Scourge of the Outer Rim was obtained from the "Season 4: Fortune and Fame" reward track.
Seeker was obtained from completing "PvP Season Seven Prodigy" achievement.
The Final Bastion was obtained from completing "PvP Season Three Prodigy" achievement.
Veil Piercer was obtained from completing "PvP Season Two Prodigy" achievement.
War Machine is obtained from completing "War Machine" achievement.
Warzone Hero is obtained from completing "Warzone Hero" achievement.
Way of the Warrior was obtained from the "Season 8: Champions of the Wild" reward track.