7 Days to Die

Below solution use the game glitch and probably will be patch for future update, it require a boosting partner

Credited to Topsi Krett when i PM him to enquiry the glitch

1. Create a private game and invite your boosting partner
2. Collect at least 1 vitamin (find at some pop pin pills store)
3. Craft a stone axe
4. Collect at least 8 stone
5. One player craft a campfire (require 8 stone)
6. Press "Y" to use campfire
7. Put vitamin (or any resources you want to duplicate) at the output section, DO NOT CLOSE THE MENU
8. 2nd player use the stone axe to destroy the campfire, then craft a campfire at the SAME LOCTION
9. 2nd player press "Y" to use campfire, collect the resources at output (in this case the vitamin)
10. Close the menu and press "Y" again, the resources should still stay there allow you collect indefinitely
11. Once completed (you should need around 300-400 vitamin to increase to 200 wellness)
12. Take turn for another player

I've found the easiest method for this achievement, and the 200 wellness achievement is as follows;

It does take a little grind (took me roughly 1 hour 30mins IRL)

Start up a server with the following settings:

Difficulty: Scavenger
Daylight Length: 18 (recommended, not needed)
Enemy Spawning: Disabled
Loot Respawn time: 5
Loot Abundance: 200
Air Drops: 24
24 hour Cycle: 10
Mark Air Drops: ON

For the first 30mins of the game, do the basics to survive, collect glass jars, golden rod and painkillers. You can even get yourself somewhere setup to grind this achievement.

As an added bonus, put whatever skill points you've gained into The Survivor as this will increase wellness from everything you do.

Now after doing the above I had amast around 140 goldenrod teas and around 140 pain killers.

All you need to do is take the pain killers until you're really thirsty and then drink the goldenrod tea until your not thirsty, rinse and repeat. Like I said it took me around an hour or so to get 175 in wellness.

Hope this helps.