no one really knows. There could be more to konquest that has yet to be discovered.

on my nathan profile: almost everything but failed to get everything in the village and the white lotus eblem.
on my nathan44 profile: almost clomplete with everything in the konquest faq on gamefaqs including that mission with the psycho chick who wants you to give her a letter that wshe wrote to herself.
though, yeah, theres possibly alot more to konquest then meets the eyes.

my brother jsut finished all of the main stuff, now hes doing the side missions, take shim a while becuz i ahve to challenge him every few minutes;)

Not me. I was a few hours ago at Crow's walkthrough Konquest guide( very helpfull I may add). I was going down the list of things I need to do. I am done with Earthrealm. Now I am in the netherrealm. I am about half way through. Not to start on the super unlockable stuff again the main reason I am trying to 100% beat Konquest is because just in case you need to have beaten Konquest to unlock the super unlockable characters. Boon has hinted at the fact " long after you are ****FINISHED*** with Konquest you be able to find some secrets deep in the game.

How do you know when youve completed the whole thing does it tell you or is there a percentig status somewhere in the game?

dont know, thats why i asked if anyone actually completed Konquest 100%. i gave up Konquest after i unlock everything in the Krypt but im planning on going back to do all the sidequest.....eventually.

I can't recall training with Tanya. Does anyone know where this happens? I might have but can't remember. I have done all the rest I am fairly sure.
Where is Nightwolf to train again (going through the 2nd time for the lotus headband thing)?

You train w/ nightwolf in Earthrealm and you train w/ Tanya in Edenia by the waterfall in the palace.

I've completed everything that's been listed thus far (including the White Lotus missions)... trained with everybody, found every chest, koin, and key. seen every kameo kharacter (meat, motaro, kintaro, and the ones that run away like Scorpion, Reptile and Stryker)
i don't know if this is everything in Konquest however