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The collectibles on this map are in the form of bobbleheads. Shoot 10 to unlock this achievement. Refer to "Catacombs Cash" in the main guide for more information.

The collectibles on this map aren't available all at once. As you complete waves, you open up areas that were previously inaccessible. Therefore, while you cannot get all 10 bobbleheads with the strategy of leaving one Zed alive, you can do this until all collectibles for that wave have been obtained.

You need to play Endless Mode to play on this map. The earliest you can unlock this achievement is on Wave 6 when you have access to the upstairs.