This guide will show you how to acomplish all puzzles/eastereggs I know about. I wrote half of this guide, the rest is copied from http://www.powerpyx.com/cod-ww2-pack-a-punch-guide-the-final-reich/ So all credits go to them If you have any recommendations... 

How to fix stuttering in Cod ww2 

This guide will tell you the secrets of the hidden challenges required to unlock all characters in COD:WWII Zombies. From The Final Reich map to The Frozen Dawn. 

【使命召唤14】中每个地图都有隐藏的挑战，也就是游戏菜单里“士兵”——“档案”——“挑战”。当完成每个地图指定的挑战后，就会解锁相应的隐藏角色。 

so if you want to get good and be like wavedrippa here is what to do grab a gun shoot at the enemy tbag the enemy repeat stage 1-3 until you get called a hacker in every game