Technically, there are two Aquaman skins in Fortnite. The first is the classic Aquaman skin with the gold scale shirt and green pants, and the second is just a shirtless, tattooed rendition of Jason Momoa. You can’t unlock the shirtless skin until you unlock the classic Aquaman look, so let’s start there.
Before you can earn any Aquaman skin, you need to buy the new Battle Pass. The pass is 950 V-Bucks, or about $9.50. If you have completed past battle passes, you should have more than enough V-Bucks to buy the latest iteration, so go ahead and purchase it if you want to play as Aquaman.
After you own the battle pass, you need to complete special Aquaman Challenges. Each week features a new challenge, but they don’t disappear if you can’t complete them on time. Pace yourself and don’t rush (but don’t be too slow — you still want to unlock the skin), and you will eventually earn the classic Aquaman skin.
The Week 1 challenge requires you to use a whirlpool at The Flotilla. Just swim into one (or float into one from the sky), and that’s it. Challenge done.