Abstergo challenge - 9 different weapons bug (Xbox)?

[Subtle54]

I've definitely completed this challenge but it's only showing 8/9.
Proof :
1. Rope dart (hung 5 completed 7/15 killed)
2. Throwing knife (disarmed 3 agiles & killed with own weapon completed)
3. Pistol (kill 5 with headshot completed)
4. Berserk dart (10 enemies being killed by berserk guard completed)
5. Unarmed (who hasn't strangled & then stomped a few heads)
6. Axe (yes I've picked up a brutes axe and killed with it)
7. Hidden blade (initiate challenge completed)
8. Rifle (both shot and bayoneted)
9. Sword (most used weapon)

Have I missed something or is this a bug?

[Kagurra]

I've heard of this problem before. Possibly a bug.

[Subtle54]

Support ticket filed

[ElderMark]

I wish it isn't another bug. sort of sounds like the one I have in ac3 with my assassin being at 99.9 yet hes a grandmaster

[Xtrava]

Already raised elsewhere. Still not fixed.

[Krayus Korianis]

THROW THE AXE! O_O lawl. But seriously, I lodged an axe into an NPC's head and it popped for me.

[JackSlater1321]

I am also having the same issue, despite going through each weapon again. Another forum suggested this strategy:

"Go into data management, delete your PROFILE data (it is labeled as such), but NOT your game save data. Restart the game and when it creates a newprofile it should give you credit for the achievment."

This did not work for me. Would like to know if it helps anyone else.

[Kagurra]

Did you do the single sword you can take from enemies? Or the axe special move? I had zero problems with this (xbox one) and unlocked it as soon as I got the rope dart.