From time-to-time Fortnite offers free rewards for its fans and generally, they are given per platform.
This is the case of the latest Volcanic Ash Sassin pack, which will be available in the Epic Games Store between May 19 and June 16. However, you have to complete quests to unlock the various cosmetics come with this pack.
To get the Volcanic Ash Sassin pack for free, all you have to do is to visit the Epic Games Store. It will be available to all players with access to this platform between May 19 at 5 p.m. and June 16 until 5 p.m. as well.