Question about unlocking living stories
Living Story Season 1 (everything up to now), wasn’t implemented with this unlock system in mind. If you’ve missed something in the past year, it’s gone and lost forever, excepting those events like Dragon Bash, Halloween, Four Winds… etc, that are an annual thing.
There is no option to unlock Season One episodes. There may be some time in the future, though.
The announcement https://www.guildwars2.com/en/news/introducing-the-story-journal/ speaks to the upcoming Season Two Living World content.
For additional information: http://www.twitch.tv/guildwars2/profile