Absolver

This will come naturally whilst working on Getting Serious. Simply defeat 100 opponents in 1v1 or 3v3 to earn this one. In 3v3, the kill feed needs to show you killed the player for it to count, so be mindful of people kill stealing in that mode. 1v1 is the easiest source because each round count as a separate kill so winning three rounds is three kills. Killing players in the open world will also count to the total.