"Kill Troublesome Bandits" failed.

[Saber Cherry]

I did a "Kill Troublesome Bandits" quest for Uxkhal, defeated the bandits, and spoke to the shopkeeper... and my options were "I'm still working on it" or "What if I can't kill the bandits?"

I had an unrelated concurrent ale delivery quest to another city.  But for whatever reason, killing the troublesome bandits did not trigger completion.  It was probably my 8th one for that game, and all the others worked fine.

 

[Saber Cherry]

Many days later, I went back and talked to the shopkeeper, and it succeeded.

 

[Archonsod]

IIRC kill quests require you to kill, not capture. If you'd took any prisoners that could cause it, at least until you sold them.

 

[HardCode]

You can take them prisoner, too. After you complete the quest, you need to see the message stating the same. Did you fight them close to the city or use the teleport cheat to go back to the city? If so, there was probably not enough time for the Trigger that completes the quest to fire.

 

[Saber Cherry]

IIRC kill quests require you to kill, not capture. If you'd took any prisoners that could cause it, at least until you sold them.

I always capture rather than kill, and it's always worked before.

After you complete the quest, you need to see the message stating the same. Did you fight them close to the city or use the teleport cheat to go back to the city? If so, there was probably not enough time for the Trigger that completes the quest to fire.

I don't use any cheats, but I did fight them close to the city, and go directly back.  So, I suppose that explains it.