Collected everything. The difficulty seems to be uber (I will not say for sure, because before that I passed it myself, but they did not count with cheats).
1.To open all the secrets, you need to select a level and pass it.
2. Achievements “save Wyatt” and “save Fergus” are obtained If you go through the very first level by choosing different people, respectively.
Wolfenstein: The New Order: Save Game (100% Completed Game, Grade A +) Free Download
Where to throw the save
C: \ Users \ * username * \ Saved Games \ MachineGames \ Wolfenstein The New Order
Verified on Steam license on 07/24/2014, but it also works for a crack from a reloader, they say.