Realm Royale Reforged

This isn't a full guide but a fairly easy way of getting this achievement with minimal skill/effort and just a tiny bit of luck was to load into games, wait for them to start, and just stay inside of the airship to the very last second and not adjust where you will land. More times than not, at least one player will do the exact same but because they are afk. So you are able to just kill them with your knife since they won't really be fighting back. This will also often give you potions and resources to be able to use for crafting at the forge. Must be done as the Warrior.

Select the 'Warrior' class when entering into a game of Solo, Duos or Squads.

The best way to get a kill if you aren't great is to drop off as soon as you are able to because a lot of other people will be doing the same, and you might be able to catch them weaponless.