@Grimoir
The answer I got in my ticket.
"Hello,
Rest assured that the Battle Pass can be completed without the use of Battle Potions. As mentioned previously, please complete the remaining available tasks in your Battle Pass in order for you to make progress.
I hope this clarifies the matter.
Regards,
Senior GM Yehara
NCSOFT Support Team"
Which would lead me to think there will be future challenges unlocked after we completed the current ones.