Ready for War 20G
Earned at least one Onyx medal

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There are a lot of medals you earn in the game for doing various things such as amount of kills, number of matches played, etc. You can find these in the Medals section of Stats and Awards. Most of the medals have various ranks to earn. They are shown below on a list with stars. Onyx is for completing the 4 star section. You only unlock it by finishing the previous ones. You need to earn the War Supporter Onyx medal for a different achievement, so you will unlock this while going for that if nothing else.

Survivalist: Besides playing in the events, this is the medal most people will get to Onyx first. It requires you to complete 40 sections in the campaign without reloading form a checkpoint. This means you can be downed, but you can "retry" that section. This should come with natural progression while playing on Casual. If not, you may replay a section you felt was very quick or easy (like the first one in the first chapter).

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