I got achiveements, I did not checked why, I just thought I earned them. I am on a map where I just killed about 150 land units, got attacked by coalition of 5, they did not had any air protection and my 40 bombers killed a lot of troops. Then I got achievements and I had more gold that I save just in case, so I spend it. Now I have less than I keep if someone else use it.
"Then, when you run out of ammunition and the enemy continues to advance - to the bayonet, when they break your knife - to your hands, when they break both of your hands - to your teeth, when you get the last tooth knocked out, as long as you move, as long you are there - attack! When they mortally wound you, see to it that you fall in their way, so they have to go around you, jump over you or move you - bother them even in death!" speech of lieutenant Tasic before battle of Cer 1914.