Now with the new update their can spawn 50% more zombies than before. So this method to get the achievement will get much tougher I think - till yet I didn't try it. But to my mind with some concentration it is still possible to get the achievement.

Survive for 5:00 in endless night mode


With this method I got the achievement while playing alone the endless night mode. After two minutes my friend already died and I was alone.
Maybe you have to try this a few times, for me I got it the first try ;)

To get the achievement with this method, just run and run around the map. Just shoot zombies when they could hit you. You don't even need a good gun, you can play with your pistol. The zombies don't get more HP like in Defense mode. Four shots with the pistol and they're dead.

There's a maximum for zombies. And if the maximum is reached there can't spawn more zombies. Logical hm?
So, the zombies are following you in a big crowd. Everyone of them wants to go the same way directly to you. So you just can run around the map. But you have to be careful: Sometimes there's one behind you. Then it is better to shoot him when he goes in a dangerous zone for a hit to you. But when you killed a zombie another one will spawn somewhere on the map. That can be dangerous too.
Now, you just have to do this five minutes without dying. Shouldn't be too difficult, right? ;)

This should be the easiest and fastest method to get the achievement.

(For sure, if you get the achievement by playing it "right" with shooting zombies and surviving, then you are good ^^)

Thanks to you for reading this guide. I don't think it's the perfect explanation so I would be happy if you could tell me whether this helped you with getting the achievement or what the problem is with getting it. I will edit this guide occasionally.

Best regards