I have been playin Assassin's Creed 4: Black Flag since the last month. Since from the start of the game..whenever i go to the Overview challenges..it says The core challenges are not available and the time-limited challenges will be back soon. i have been waiting so eagerly to play those challenges but they don't show up. Please look up into this problem and get me my challenges AS FAST AS POSSIBLE!
When Uplay transitioned into Ubisoft Connect, support for older games challenges was cut, this probably was because they completely rewrote the challenge system, however to negate this effect they awarded ALL the rewards in the older games without the need to do any of the challenges. You cannot get challenges back in older games.
Hey vamshi3031, thanks for getting in touch, welcome to forums and sincere apologies about the delayed response.
Just as XghosT76 suggested, with the transition to Ubisoft Connect, rewards have automatically unlocked and challenges are disabled for a number of titles. For more information, click the following link.
I do apologise if this may not be the outcome you've anticipated and should you have any further questions, let us know!