The repo represents a "BlizzLike" server in its' entirety. The 640MB of SQL actually does contain all of the quests for WoW 3.3.5a.

A sibling commenter quipped about which quests are bugged and which aren't, but the reality of it is that the vast majority of quests work perfectly fine, including the quests that are heavily scripted (such as the Battle for the Undercity)