I recommend making a collective thread (good english?) for problems w/ achievements within BLITZKRIEG.
I remember some others, but here is my latest:
MINSK - Slonim (opt. ach.) [see picture]
I play german version 2.9.6g. Difficulty 4/5.

Thanks for the cool game and DLC. I like it very much.
(But here is more minor stuff I dislike:
1. Line of Sight: I'm not sure how far all the units can see. I know it's described in the manual ... but still. I think you could implement something into the game. It's crucial to know if an opponent force will see you or not.
2. A Withdraw-Button: It's annoying ... sometimes you click onto a hexfield by incident ... or often I chose an airplaine mispercepted as another and make a stupid move. A reverse button would be too cool.
3. Who will have the FIRST TURN? - For planing strategy it would be good to know who will have the first turn. )
btw: It's really disappointing to make a tactic and play a lot of time just to see the text not telling the real need of the achievement :'-(