I've obviously fired weapons....a.k.a using items:

http://prntscr.com/51utsc

Yet I still don't have the achievement:

http://prntscr.com/51uukf



*: Screenshots posted in chronological order.

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Is it only working for medical items or something? Logically, guns are items, so therefore shouldn't I be getting the achievement?

For the sake of adding even more proof, I'll add my Fire Delay screenshot:

http://prntscr.com/51uuzn

As I understand it, you would need to use an item that actually has a use option, so a medical item should count for that achievement (as well as for the medical item one).

Yeah I'm sure Syn is correct. Bacta Patch, Healing Stick or Force Detector should work to get you the achievement Lara.

Not 100% sure but 99% sure that Medical item will not trigger Use an Item
Use an Item in your adventures. I have use as Bacta Patch, Healing stick, Bacta refill a few times and nothing of that "field" trigger that achievement.

I've earned that Achievement, but I have not taken notice when it happened.

Probably it was on the first time I used an incubator to hatch an egg.

I can't remember how I got that achievement as it as so long ago but I have only ever used Bacta patches and healing sticks on myself. I did heal someone else with a bacta patch though, but I'm sure that doesn't make a difference who you use it on.

I remember earning it when I crafted a keycard for the first time.

Yep crafting a keycard gets you the Achievement.Firing a gun does not.

Firing a weapon and using a medical items do not give you the achievement. Using a Crafting Kit or Electronic Lock Breaker, for example, can give you the achievement.