The HxH anime went a considerable way into the manga, but there's still a lot of manga content that wasn't animated. This could be due to licensing issues or creative decisions by the production team.
The HxH anime covered a significant portion of the manga, but not all of it. Some storylines were left unfinished or adapted differently.
Well, the HxH anime covered quite a bit, but it didn't reach the very end of the manga. There were certain arcs that were either shortened or excluded for various reasons related to production and pacing.