Beating the game on any difficulty warrant this achievement buts best if you pair it with a higher difficulty achievement like "I am death incarnate!" or "Mein Leben" for beating the game on the harder and/or hardest difficulty respectively. You should also keep in mind to knock out all of the collectible related achievements.
*** Spoiler - click to reveal ***Be sure to also grab "Keep Playing," for waiting for the game to resume after the credits so you can mop up any missed collectibles or Ubercommanders.
The guide I used for mopping up collectibles as I played was courtesy of IGN.
https://www.ign.com/wikis/wolfenstein-2-the-new-colossus/Wal...