Knight honor achievement

Do I need to have the weapon until I get the achievement or can I just pick it up and drop it and still get credit?

This is what I need mainly (not all that I need but it would be helpful)

Moonlight Greatsword

Priscilla's Dagger

Grant

Sanctus

Greatsword of Artioras (Not cursed)

Great Shield of Artioras

THX

Oh BTW

Turnip78 (PS3)

SL 101

All that I need now thanks to 2 of my friends is Greatsword of Artioras (Not cursed)

Great Shield of Artioras

Now I only need Great Shield of Artioras

Did you get the achievement? I was wondering the same thing. Does it count toward the achievement if you had a weapon a couple of playthroughs ago and dropped it?

You have to have them all at the same time on the same character.