The achievement description says,
Win a match by collecting only mithril
Even with the highest mineral setting, getting down deep enough and being lucky enough to have several mithril deposits is uncommon enough and, even with the lowest AI settings, that doesn't seem to be enough to beat them.
I've tried using a monster swarm with the highest spawn setting to keep the enemy out of commission, but the ramp up until the other team is overrun is long enough for them to score better than all the available mithril and, if the map runs long enough, I get swarmed too.
I'm surely missing something.
Monsters drop minerals in mixed batches so that would invalidate the "only mithril" aspect, wouldn't it?
Can I collect relics and still get the achievement?
What's the trick? What's a simple strategy to get this or is it simply a matter of luck and the AI getting terrible relics?