The following quests are offered by Sylvanas Windrunner in World of Warcraft and its subsequent expansions.

Vanilla Edit

Silverpine Forest Edit

Forsaken High Command[57.4, 10]
Forsaken Front[51.8, 60]
Objective of
The Greymane Wall[45.2, 84.6]

Undercity Edit

The Royal Quarter[57.8, 91.6]

Western Plaguelands Edit

Andorhal[49, 63.6]

Wrath of the Lich King Edit

Forge of Souls Edit

End of the instance[44, 13]

Pit of Saron Edit

Beginning of the instance[40.8, 79.6]
End of instance[45, 20]

Halls of Reflection Edit

Beginning of the instance[45, 76]
During the Lich King encounter[13, 22]

Icecrown Citadel Edit

Beginning of instance[38.6, 19.4]

Legion Edit

Durotar Edit

Just outside the main gates[45.6, 15.8]
Objective of
At the eastern docks[61.4, 9.8]
Objective of

Undercity Edit

The Royal Quarter[57.8, 91.6]

Stormheim Edit

Near Skold-Ashil[56.8, 66.2]
Skold-Ashil[62.6, 68]
Near Dreadwake's Landing[55, 72.6]