
Click your resources in the top right and there you can use boosters which you have acquired one way or another.

I've built quite a decent army and I get quite some boosters for resources from attacking the renegades. For resources: - I'm currently constantly doing the renegades. Though time needed for upgrading one level increases with each level that I add to the HQ. I'm currently at Headquarters level 8 after about 2 hours of gameplay. It will take quite a while to get this achievement, very much in contrast to the other achievements which are a breeze. You will need to get a lot of resources for this, and besides you will need to upgrade a lot of other buildings as well, as for some of the levels I had to upgrade other buildings to a specific level as well.

Polymer unlocks at level 10 and then thorium at level 16.

You have oil and steel unlocked from the start. Thorium is a resource locked until your Headquarter is upgraded towards level 16. This achievement requires you to gather 500 Thorium (Or at least it seems like that if the achievement description is correct). Before going to actual solution I'd like to mention that I usually don't post solutions before I unlock them myself, though for this achievement I thought it might help if I already posted some of my findings.
