Ammo Conservation is a secret achievement/trophy featured in the Call of Duty: WWII Nazi Zombies map The Shadowed Throne. It requires the player to obtain the Blade of Barbarossa without firing a single gunshot.
This achievement restricts the player to utilize only a handful of items, such as any of the melee weapons found on the map, the player's lethal equipment such as grenades, and the Wunderbuss' beam firing mode. The player can also fire geistbolts from the Wunderbuss. However, the player cannot shoot any other weapon. If the player does shoot anything aside from the aforementioned Wunderbuss' beam firing mode, the achievement will be disabled and the player must restart the match in order to try again.