Call of Duty

You'll need the Tombstone Park, which will, upon death, spawn a tombstone that you’ll be able to retrieve in your next game that will contain all of your backpack's inventory.

This park can be gained as:
- a lootable soda can available as a contract reward (possible to exfil)
- rewarded as a random perk power-up when someone completes their story mission
- bought from a perk machine on map
- a blueprint

If earned as a drop from a contract reward, you can stow it, exfil, and save it for later to bring it on a run specifically for this achievement.

Once it's activated, die, don't be revived, and quit. The next time you spawn in a DMZ instance, you'll find a tombstone icon on the map. It will be in the same location you died previously. You could spawn near it, or across the map.

Navigate to it and loot your tombstone to unlock this. You will be able to loot back the contents of your backpack, but will lose things like the armor, gas mask, self revive, and rucksack. It may be worth trying this after a failed exfil where you don't have good gear, or on a 2nd character from your main.

MWZ (Zombies)

This can only be achieved with the Tombstone Soda perk. Once you've acquired the perk (white RIP gravestone icon), completely bleed out and leave the game. The next MWZ game you join, you'll notice a tombstone icon highlighted on your Hud (where you previously died). Here lies your tombstone, which can be looted to retrieve your previously "lost" gear.

There's a few ways to get the Tombstone Soda perk:

1. Contract Missions: There's a small chance you'll be rewarded with a useable Tombstone Soda Can. Which can be stowed in your backpack and exfiled, to use in a following MWZ deployment (preferred method).
2. Story Missions: Upon completing a story mission you'll be given a random soda can perk, which could be the Tombstone Soda one. If so, you'll need to die during this session as the perk will be lost upon extraction.
3. Vending Machine: The MWZ map has a vending machine for each soda can variant. Look closely at the map for a RIP Tombstone icon. Head over to the vending machine and buy the perk for $2000. Similar to the story mission this will need to be done during this session as it can't be extracted.
4. Blueprint: There's a very rare chance the Tombstone Soda Can blueprint will drop from a random enemy within the MWZ. If you are lucky enough to find the blueprint, you'll be able to craft a Tombstone Soda every 3 hours within the inventory menu before deployment.

Preferred Method:
Acquire a Tombstone Soda during random contract missions with friends. This variant of the perk can be stored in your backpack, exfiled with and equitable for future deployments. Once I'd extracted with one, I turned off Squad Fill, equip a weapon and the Tombstone Soda can, then joined a MWZ solo. Upon spawning in, drink the soda can, get yourself killed and bleed out completely. Leaving you with only one option to leave the game. Join a second MWZ game, either solo or grouped and you'll see a tombstone located on your Hud and the map. Grab the closest vehicle and head straight to it. Loot the tombstone to collect your previously lost gear and pop the achievement.