Talisman: Digital Edition

One of the Warrior's special abilities allows him to use two weapons at once during combat. To do that, he will need to acquire both of them, as he doesn't start the game with a weapon. Buying a weapon at the village will cost 2G for a sword and 3G for an axe. Weapons can also be found in the adventure deck.

The achievement unlocks when you defeat an enemy with two weapons. I'm not sure if defeating another player (and making them lose a life) counts for this, sorry.