Tips-
Do the wolf hand in quest (5 badges each) till you can’t hand it in.
Kill korrak at the start (10 baddges)
Kill people and loot them (1 badge per 20 scrap)
Do the mine quests (2 badges each)
After enough mine quests you can get and order from a Seargent for 5-10 badges each.
Do initial quest objectives (do this passively focus on the others though)
Each win is 10 badges a loss is 5 badges. So even if you lose you progress which is good.
Best classes to do this on are ranged since melee sort of feel horrible to play in big battlegrounds unless you zerg.