This is something we have been keeping a very close eye on - for those who don't know the objective of this optional goal is to unlock a title that can be purchased by your faction on your shard.
If a shard/faction is not able to complete the challenge for this phase it will be available again next year for you to unlock (and very likely the year after that). The next five phases have similar challenges but should be impacted less by your shards population, that said though we'll keep a very close eye on it.
Our goal is to make sure everyone has an opportunity to unlock the titles, however, these are bonus achievements so don't expect to get them without any effort!
Definitely something we're going to continue to watch and learn from - appreciate the constructive feedback you've all continued to share, please continue to do so.