Borderlands: Game of the Year Edition
81 Achievements
64-76h
Duel-icious
Won a duel against another player
25.7%
How to unlock the Duel-icious achievement in Borderlands: Game of the Year Edition - Definitive Guide
Start the game in splitscreen and as soon as you are able to move have both characters punch each, this will start a duel, have your main account kill your spare account and the achievement will pop.
If you do this without taking damage you will also get
To start a duel, simply press the right stick in while aiming at the other player to challenge them to a duel. The other player/controller needs to the same to accept the duel challenge.
Just win the duel and if you win without taking any damage, you will also get the
Walk up to your co-op partner and melee them to propose a duel, and have them melee you back to accept. Kill them and you will unlock the Duel-icious trophy. If you're boosting this, ask your friend not to attack you back and you will also unlock the trophy below:
This can be unlocked with a second account and controller. A silver account will suffice.
While playing in splitscreen with a second controller or over Xbox Live with a friend, use the melee button to melee attack the second controller's character, then melee attack your main character with the second controller and a duel will begin. Then simply kill the second controller with your main controller.
This can be unlocked along with "Duelinator".
For this to work you must have the Duel Requests option in the Options menu set to "Accepted", you can turn it off afterwards if want to. You can duel anywhere though pick your spot carefully as you don't want to be swarmed afterwards by enemies. To initiate a duel you both need to melee each other by pressing . You can choose to duel it out or let the other person win by "killing" him/her or by leaving the "duel bubble".
Also see Duelinator.