I was about to ask that too.
Sal's Realm wrote:
Needed Quests:
* A Tail of Two Cats - for the truth about Bob.
* Biohazard - for the map of Ardougne.
* Ghost Robes Mini-Quest - for information on Zamorak.
* The Grand Tree - for information about the demon and glider.
* Hazeel Cult
* In Aid of the Myreque - for stories about the Myreque.
* Making History - the Varrock Museum is full of history!
* Merlin's Crystal - for a description of Excalibur.
* Observatory Quest - for information about the telescope.
* Priest in Peril - for information about the River Salve.
* Shadow of the Storm - for a description of Silverlight.
* Shield of Arrav - for the shield's description.
* Temple of Ikov - for a description of the Staff of Armadyl.
* What Lies Below - for the Dragon'hai history book (you need it in your inventory when you talk to him before he will add any information about it to the display. You can find a copy of the book in the Varrock library or in your POH's bookcases).
This is where I found my information :
http://runescape.salmoneus.net/varrock_museum.html
No need to go there unless you really want more information. Only pasted this link so it wouldn't be plagiarizing.
Edit: And you obviously need Digsite Quest, but I think you already done it.
Edit2:
I'm adding a question. Is there a difference in your reward between if you have 151 kudos and 153?