"Trickster" achievement

[kwasowsky]

"Have won the mirror battle with less than 5 squads." - What exactly does it mean? For example I can have only 4 mages and nothing more? Is there a specific encounter that I have to fight to unlock this? Because from description it should unlock at the beginning of the game.

[kwasowsky]

Never mind. I've got it. I didn't imagine it would be that easy. I'll leave it this discussion if someone else gonna need some explanation.

Basically, when you unlocking fire mages you will encounter a fight, with same crew you have (exactly here: https://i.imgur.com/qqmM4SE.jpeg).
All you have to do is select only a fire mage (4 of them - do don't buy 5th, but buy a meteor spell). While fighting mage vs mage just use shield of you for protection and broken shield on your opponent.