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The collectibles on this map are in the form of Dr. Hans Volter plush dolls. Shoot 10 to unlock this achievement. Refer to "Catacombs Cash" for more information.

The collectibles on this map aren't available all at once. When you start, you are in a small area and at the end of each wave you drop down through a hole to the next area. There are 10 different non-boss areas and are completely randomized, so if you are following the video below, it might not be in the same order as the game you are playing. Each area has 2-3 collectibles so the earliest you can unlock this achievement would be Wave 4. It is recommended that you play a Long game (10 waves) on Normal as the more powerful enemies don't show up until later waves.