Firstly the icons for City Management III 'Union Man' and V 'You can keep the change' achievements are transposed (2 stars and 1 star accordingly):
Upper left <-> lower right of the mini screenshot.
And for Warfare, to balance the achievement difficulty by moving the I II and III Nightmare achievements to II, III and IV.
This would mean players could get the first warfare achievement without having to have a level 14 Barracks,
it would also tweak the I, II, III and V having 7 achievements whilst IV has 5,
to II, III and V having 7, with I and IV having 6.
Hopefully this gives some ideas towards tweaking the existing achievements.