Can someone give me a complete list ( full list ) of quest that give pet scrool in the whole wonderland?

Click on the Quest Names on this site: http://wonderlandonline.wikia.com/wiki/Pet_Return_Scroll.

The part where it says:

"Obtained as a reward for completing the Saar's Research quest, Frog Quest, Big-Eye Monster, Man-eater, Find the Sledge Wolf, Is It A Cow Or A Horse?, Rescue Laifu, Frog Quest, Disappeared Odessey, The turtle is afraid of the iron gavel, Help Momotaro hit ghosts, and The lost buffalo.

There is also one located in a chest in Korea across the river between the two waterfalls."

You can also try this list: http://forum.wl.igg.com/viewthread.php?tid=13236. Pet lethe scrolls are below the Forgotten Scrolls on the list.