During the adventure you gain the chance to choose skills. (once at the beginning and after you gather enough XP)
* The goal is for you to get to the last raid with a resource bag on your back

* Just make sure to select skills that let you keep your item after death.
* You can restart your adventure until you get one that works
* Hope that during the raid before last it triggers

* Start a 3 player game (Use the keyboard to spawn 2 more plaayers)
* Build the boat and place 1 player inside it.

* Durring the final flood Have 1 player die at the bottom of the level when the water is high enough that a respawn won't happen

* The remaining player now grabs a bag and steps onto the dead player from above, could require a few tries

* You can store the bag in your personal slot until the last raid
* Bring it with you durring the last raid. Careful not to lose it.
* You CAN jump in the final baloon-ride with the bag on your back.
* If you did it correctly you'll see the Bag at the end of the game drring the brawl

* Congratulations. You now have the achievement