This achievement is actually quite simple. When the game starts up, go to the single player menu and select training, once you have done this a mission will start up.

The mission consists of lots of skippable text, presented to you by Raven, moving soldiers to some yellow circle, destroying one enemy light infantry, one enemy scout, and last but not least, capturing a capitol in the northeastern most part of the map. 

This achievement can be done in any game mode. The best thing to do is to play a hotseat match with it being you vs yourself on any map(take out the AI and set the match rules to "capture capitol"), from here proceed to capture all oil wells so you can get the money you need and take any and all factories on the map.

Heavy tanks are near the bottom of the list of vehicles you can build, in-between light tanks and light artillary; they also cost $3000 to build. Just keep cranking them out over the turns. Once you have 10 heavy tanks on the maps at once, end the match. The achievement should pop as soon as your 10th heavy tank exists.

• Tactics is the hardest catagory of all. Your tactics score is always based off the amount of damage you deal vs the amount you deal. The best way to avoid damage is to use units that can attack out of the reach of the unit you are attacking. The best units for these are artillery (which are immune to all counter-attacks) and air craft (which are immune to all ground troops.) I would recommend using Alec Falcon (who reduces damage) for the starting missions until you unlock General Regina (who increases artillery range.)