If you have multiple characters only progress the seasonal story on one, my main character is my hunter and it was one pirate hunt off of finishing the -blam!- step of the triumph needed for the title and then I went through my other characters. My Titan is my least played so was slightly behind and it has now reset my to needing 3 more pirate hunts to be able to reach back to where I was, I don’t know if I’ll be able to get the triumph now
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Switch back to your main after you get the other objectives and it will complete