I think its a glitch... I started a Campaign in very hard mode. At last combats, I lowered difficulty to normal, and ended the campaign, and I got the very hard completion achievement.
And I saw the same bug seigun reports... the secondary win condition for Ashe fails.
furthermore, 5/5
Another bugged badge.... 240 seconds in challenge mode. Submited... waiting...
And, of course, Im not wasting another 10 minutes in a new run for it... 1/5, for the point at voting