Hey there everyone.!

So i managed to get all the achievements in the game by simply
verifying the game cache.






To do this you have to go to your:
Library > Right click on the game > Properties > Local Files > Verify Integrity of game cache
wait for it to complete then join back into the game.!

If you already have finished the game...(If you didn't you should definitely do it)
..and you dont want to waste your time trying to beat the game on "Hero" difficulty all over again then you can use the console to help you out.

Open up the console by pressing ( ` ) its right next to button number 1 .

To kill all the infantry type : killbots
To kill Tank crew type : killNMEbots

Notice than in the Soviet Campaign if you use the Tank you can use killNMEbots will get you killed aswell but dont worry just click on the " Restart From Checkpoint " option and you are done.

Hope this will help you out and you can get the achievements. :)

Notice that it's my first ever "Guide" :P
Give it a rate if that helped you out.!
Peace!