The Outer Worlds

As others have said this will come naturally by playing the game especially on Supernova.

If your like me and like to get the easy achievements out of the way just do this:

Start a game up, as soon as you land and are walking along following the prompts (tutorial). You get to a section where you jump down and are told you need medical aid and to use your Medical Inhaler.
*This can be done at anytime you have inhaler charges.

BEFORE YOU DO THIS SAVE YOUR GAME.

1.Now use the inhaler 11 times (LB). Save your game again in another slot. This updates the achievement tracker.

2.Now load your first save and use the inhaler 11 times again. Save to your second save.

3.Repeat till you get achievement takes about 20 minutes.

Edit: Per Kerman7 this carries over on multiple playthroughs.

- Pressing will cause you to use a medical inhaler (used to heal you)
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- This could come naturally if your going for all the cheevs
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- Keep in mind you can create medical inhalers yourself in the menu using healing items! (use only one slot to maximize your inhaler uses)
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- Remember the SAVE trick to help you grind this out faster
One trick that helps with all of the "do this X amount of times" cheevs...use the SAVE feature to RELOAD SAVES helping you grind those out easier. *However people have said that it can cause the tracker to stop going up...so if this happens, try saving after you do one run, SAVE on a new file, then RELOAD the old one. Rinse & Repeat.

All of my HD Achievement Guides for The Outer Worlds can be found here! :) (Mobile Friendly)
https://www.bradleafsfan9.com/the-outer-worlds

As Sashamorning said, reloading your save won't work.

The easiest way is to start a game on easy (Story), kill and loot as many people as you can, when available, unlock the "Snake Oil Salesman" perk in the Tier 2 perks tree, it will grant you 50% more Bits for each item you sell.

Then go to a vending machine and sell everything you have, you will need to visit multiple vending machines so make sure you have fast travel points in different areas, buy 300 health consumables, they don't have to be Adreno.

Depending on your Medical skill (under Tech), you will have between 1 and 4 Inhaler slots. If you have 2 or more, fill them with anything you have, use the Inhaler until your slots are empty, fill them again with something else, rince, repeat and the Achievement will pop

I recommend using the Achievement Tracker for this even though it's quite glitched with this game (stops tracking and requires to restart the game).

In this video guide I will show you a way to use the medical inhaler 300 times. This is the way I would recommend for players wanting to get this achievement without all the extra saving and reloading. Try to make a habit of going to the vendors every time you come back to a town or location that has a vendor throughout the game. If you keep on buying them when playing the game, and if you keep looting everywhere. You will definitely have enough by the end of the game. Once you have saved up 300, make a manual save. Then keep using them until the achievement pops. It shouldn't take more than 15 minutes, even if you are starting from scratch.

In case anyone was wondering how to do this without the reload/save tricks.

I'm still on my first playthrough and at about 175 inhalers used I think?

The reason I have used so many is because I accepted the FLAW/PERK from using my inhaler. It was offered to me rather early on, still on intro parts of game I think.

The flaw requires you to use the inhaler every now and then or you go through withdrawls/dependency and get a debuff, or something like that.

So I figure I should have the achievement somewhat naturally instead of having to reload/save.

I managed to complete supernova with about 150 inhalers used.

Prior to the last mission you are encouraged to make a manual save.

Save here then after completing you can use up all the inhalers you have left, I had in excess of 200 so the game gives you plenty more than necessary without having to buy more.

The achievement unlocks the 300th time you use the inhaler by pressing . For convenience, turn on the achievement tracker. Designate this achievement as a favorite so you can track its progress. The first slot in the inhaler is reserved for Adreno as the default healer. Even if you never buy it, many hundreds of Adreno units can be found throughout the game.

Note that, if you are going to play more than one game, the achievement tracks across multiple games. It is very probable that you will not need to heal 300 times during normal game play. If so, you may want to grind it. With the achievement tracker on, make a save. This is Save A. Press repeatedly until you exhaust your supply of Adreno. Make a second save (Save B) to update the system file and ensure your progress is recorded. Reload Save A and, once again, exhaust your supply of Adreno. Save. You can overwrite Save B since its only purpose is to update the system save file. Continue this process, monitoring the tracker as you do so, until the achievement pops.

Be aware that frequent use of the inhaler may trigger the drug addiction flaw. You do not have to accept it. If you do, it is one of the flaws that counts towards the following:

With this in mind, you may want to grind for this achievement in conjunction with working towards the Flawed Hero Achievement.