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If your like me, this was one of my last achievements. By the time you’ve beat the game and done everything else with it, you may already be half way.
This solution is for a fast death method with the help of a coop partner. (This can be done solo but may take you a tiny bit longer but still effective)
Load up mission 1 ‘Harbins dig site’. Once you make it to Habins camp which is the area where you need your first Scarab Key. In the middle of the camp their is a spinning blade trap right next to a Sarcophagus.
Once there, the person going for the achievement will shoot the trap causing it to kill them. Then the other person stands right next to the sarcophagus, waiting to revive them. Then the person going for the achievement will come out and repeat the process.
I have a clip here for example:
Like I said, this can be done solo if you don’t have anyone to play with. You’d just have to restart checkpoint which will put you at the start of the camp site