Stalker is an unlockable character within Call of Duty: WWII Nazi Zombies, she can be unlocked by completing a full challenge set in the map The Shadowed Throne, in this case being the "Vigilant" challenge set.
- Keep Hands Clear - Handled the Stadtjäger with causion. (Heavy Machinery)
- Complete Stadtjäger Down's boss fight without any player in your game going down.
- Just Takes A Scratch. - Took care of a mess without incident. (I'll be Fine)
- Get to Wave 31 without taking any damage.
- Hold Your Ground. - Banished the darkness from the depths of Berlin. (In the shadows)
- Get to Wave 21 without opening any doors.
- Minimalist - Rivaled the undead menace without surrendering to powers unknown. (No shiny tools)
- Extinguisher - Blew out the candles. (Snuff the flame)
- Get 10 sniper rifle headshot kills on Gekocht zombies in a row.