Call of Duty: World at War

As mentioned it's about getting it early on so you have plenty of rounds while it is still 1 hit kill. Not sure of exact round but I think around 12/13 it's no longer instant kill.

I got it yesterday with my bro when we were trying specifically for that, we literally got thompson, turned on the power, then got the bowie knife. Next get juggernog and I think a good place to stay is by the power, note they now come from behind and in front of you so play back to back and keep turning and checking both sides.

Learn to choose your target, get the stragglers. If a few are coming at once give them a few shots with the thompson to slow them down then knife the front guy and run back.

*Note it is optional to shout David Bowie everytime you knife a zombie, but I highly recommend it!*

First off, The Bowie Knife buyzone is on the wall when you open the door behind the room with the power switch. The Bowie Knife costs 3000 points, and it stays with you permantly.

Depending on when you get the Bowie Knife, this can either be an easy or hard achievement to get. If you get this in the early rounds (around 5 or 6), you'll have more than enough time to get this achievement. If you get it later on (Around 9 or 10), you're gonna have some problems.

Just keep in mind that the Bowie Knife loses it's ability to insta-kill at round 12.

The way I did this is to wait for the zombies and knife them as they come out me. This isn't actually a good strategy unless you haver Juggernaut and can survive if a horde rushes you.

It's also beneficial to have a decent weapon if it looks like the zombies will overwhelm you. Some reccomendations are the FG42, the Trench Gun (both for 1500 points), the Thompson (1200 points), or, if you must, The MP40 or Type 100 (Both priced at 1000 points.)

A final note: If you get Insta-Kill in the later rounds (Around the time the dogs mix with the zombies), go on a knifing spree! Just again, be aware of the possible zombie/dog rush and also consider the 30 seconds you have.

With that, good luck!

Even though the bowie knife is a 1-hit kill until around level 20, it's still incredibly easy to get swarmed and killed while you have it out. A good way to get safe and easy kills is to have someone else toss a monkey bomb and to knife the zombies in the back while they huddle around it. Another way to rack up easy Bowie kills safely is to hold a window and kill all the zombies with your knife. Wait until they lunge forward to grab a board before you knife, or else you'll miss. If you get 10 zombies at your window every round, all it takes is 4 rounds to get the achievement.