quest history

[Ragstal]

any addon that can show me all the quests i've complete?

[Humble Kagu]

Yeah, there is an AddOn called QuestHistory, but the caveat is that it only logs the quests you have completed while you were running the AddOn. As far as I know, I don't think there is a way to query the server for your completed quests. Here is the link for the AddOn: http://addons.us.to/addon/questhistory

[Mimma]

The API to see if a quest has been completed does not exist in vanilla. Only option is to track quests while you complete them.