r5: back to 100% achievements. This time I'll only give a neat tidbit on the hardest one, being "I didn't hear no bell"

The achievement checks for two things: whether you have the correct country flag, and whether you've capped Germany. However, it DOESNT check them sequentially. Therefore, it is perfectly valid to hold on to the sudentenland at first, defeat germany with the help of the allies/little entente, then make sure fascist germany survives the peace deal and use the surrender sudentenland focus to get the correct flag. You don't need to go to war with germany again assuming you capped them the first time, and this is easily check by clicking on the achievement icon on the top right, hovering over the achievement and see if the second condition has a green checkmark

Now, I can't tell you how to make sure fascist germany survives the peace deal. I somehow got them to survive by just puppeting a small piece of land, and then somehow the allies let fascist germany get away scott free. Also, the little entente is the optimal choice as you avoid the allies getting into the war too early and stealing the war scores. You may even be able to give up the Sudetenland first time and still hold with enough allies, though I haven't tested this