My Work is Done
From Halopedia, the Halo wiki
My Work is Done
My Work is Done is an achievement in Halo: The Master Chief Collection. It is unlocked by finding and walking over the Librarian toy in the level Uprising.
Location
At the beginning of the chapter "Step Aside, Let The Man Through", once you exit the building, make your way toward up the rocks near the cliff edge. From there, grenade jump up to the very top of the cliffs. Follow the cliff ledge to the right until you are above the small Kig-yar encampment; off to the right, in a small alcove, you will find the Librarian toy.
Trivia
The achievement is named for a line in the sixth Halo 3 Terminal, in which the Librarian says goodbye to her husband.
