One Shot achievement in Alien: Isolation

One Shot

Complete the game without dying

One Shot+0.9
8 guidesOffline Game ModeSingle PlayerMissable

How to unlock the One Shot achievement

  • Clad masterClad master3,066,695
    08 Oct 2014 10 Oct 2014 15 Oct 2014
    176 5 107
    Hello! This achievement is not so complicated once you have the good technique. Simply reloading the last checkpoint when you are about to die. However it is advisable to use cn_guide to return to the dashboard then reload the game,because when some deaths, cn_start does not work. This is the case when a catches you.

    Keep this for your 2nd run, because once the game mechanics are assimilated, it becomes much easier to do this successfully.

    Some tips though:
    - Never run
    - Against humans, use sound lure to kill them easily
    - Against the Cyborgs use the taser followed by melee (cn_RT)
    - Save your fuel for the flamethrower (2 low pressure on cn_RT is enough to scare the Alien)
    - Do not rush! Being patient will save your life many times!
    - Make regular saves so you don't have to do a long session after death
    - If you're dead or killed a civilian,reload the backup save.According to our colleagues from PS4 trophies it doesn't void the achievement.Not the current save !

    About the civilians i actually don't know if they void the cheevo. On my run without dying, I killed one, had a Game Over and the cheevo popped at the end.But in any case,if you killed one,reload your backup save to be sure. wink

    Voila, I hope these tips will be able to help you. Again, this cheevo is not complicated at all (I did it on expert) but you have to proceed with caution.

    Good stalking ! smile

    Guide not helping? View 7 more guides for this achievement.

    Showing most recent comments. View all comments.
    Yu Silly GooseWhile you can't pause on a face hugger death, you can hit the dash button which will bring up pause menu and allow a reload. I will see if this works at the end of my run. Can save people a little more time maybe.
    Posted by Yu Silly Goose on 24 May 21 at 16:40
    The SCHWARTZ 00You can definitely pause on a facehugger death. I just got the achievement today, and I was grabbed by a facehugger a few times. All three times I was able to hit pause and reload a previous save. As long as you pause fast enough that you don't see the tape-roll symbol at the top right corner of the screen, you're good. I did this on Novice btw.
    Posted by The SCHWARTZ 00 on 23 Sep 21 at 22:50
    Raziel CruentusCan now confirm, if you load previous save after seeing the death screen (and seeing the save icon) you do not get the achievement.
    Posted by Raziel Cruentus on 22 Oct 21 at 23:30
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  • sjpsjpsjpsjpsjpsjp731,221
    18 Nov 2014 20 Nov 2014 30 Dec 2021
    46 2 14
    Clad master's guide here is great and helped me out. I completed the game & all achievements (except for Self Defense and 100 Times Too Many, for obvious reasons) in one playthrough, i.e. on Hard. I can tell you that it's frustrating, but not impossible to get this achievement on Hard. A few additional tips:

    There are seven instant death scenarios in the game:
    *** Spoiler - click to reveal ***

    - If you still have a Kinect connected (Xbox One only), turn off the Kinect Movement/Noise detection. They are a neat touch to the immersive experience, but this increases your risks of getting noticed (and subsequently killed).

    - You want to be as stealthy as possible and not look for a fight. There will be rare times where running will be easier than slowly getting around people, but practice your ninja skills.

    - You can part-build devices (ie don't hit cn_LB at the end to complete the build) to remove components from your inventory. This will assist in having plenty of parts in your inventory to build when you're desperate.

    - The Pipe Bomb if thrown too close to you can kill you. Make sure you have a clear path to throw it far away from you.

    - It hasn't been mentioned explicitly here, but when you're hiding in a locker or under a table/bed and you have the motion tracker on, the Alien can hear you if it's close by. It took me a while to understand why the Alien kept finding me. The same goes for Synthetics.

    - Speaking of lockers, make sure that your health is always at or near 100%: when you're in a locker and you're given instructions to hold your breath, eventually your health will start falling. Usually the Alien isn't around long enough for this to be a serious problem, but you'd hate to die through lack of oxygen.

    - If you're not sure whether you've died or not, you can always check the progress against "100 Times Too Many" (Xbox One only). If you end up dying early on in the game and didn't realize (i.e. you thought you reloaded in time but didn't), you'd rather know you've already blown the achievement early on, right?

    - In particularly tense parts where you're being hunted by the Alien or Synthetics, have your right thumb hovering over the cn_start button. While usually you'll have a few seconds to hit it and load from a previous save, there are times where you're just going to want to remove all ambiguity and hit reload straight away. Luckily the Alien generally gives you warning (its scream) before it gets too close to you.

    - I found that the Alien either got more used to being hit by the flamethrower later in the game, or it wasn't as effective. In other words, be prepared to needing to hit cn_RT more (but still in short bursts) than a few times to scare it off in later missions. Flamethrower fuel is somewhat scarce in Hard mode, but as long as you're not too trigger happy with it you will have more than enough, and the game does provide fuel in key parts of the game where it's basically impossible to proceed without it.

    - I found that the Alien only twice got into the vents to get me (this was towards the end), so if you're hiding in the vent system it's best to hide in a corner (i.e. where there's an L turn) so you can keep an eye on both directions.

    - Missions 10, 14 and 16 were the most painful, and they're also some of the longest levels, so be prepared for a long slog. Don't be discouraged.

    - Save Often! The game design has luckily put save points in a lot of places and generally before the more difficult parts, so while you may be reloading from one particular save point often, you're keeping your backtracking to a minimum. The game DOES save collectable pickups when you reload the to your last save, but always find a save point when you're done with your session.

    - Two important tips for Mission 18:
    *** Spoiler - click to reveal ***

    *** Spoiler - click to reveal ***
    Showing most recent comments. View all comments.
    NoHeroes94Also ALWAYS hit the Xbox button not pause. Pause isn't quick enough at times.
    Posted by NoHeroes94 on 18 May 16 at 14:44
    TrombonafideIt hasn't been noted anywhere else: you can obtain this on any difficulty, so why not do Novice? By the end, I had a full inventory and max flamethrower ammo for Mission 18.
    Posted by Trombonafide on 16 Apr 18 at 01:45
    sjpsjpsjp@Trombonafide well as I said, you can complete the game on hard and with this achievement, which saves an additional playthrough.
    Posted by sjpsjpsjp on 16 Apr 18 at 02:06
  • QuizabuckQuizabuck331,618
    17 Feb 2015 17 Feb 2015 20 Oct 2015
    37 2 4
    Since I don't see this mentioned, I thought I would explain how the save loading actually works.

    You have two save slots, a current save and a previous save. If you load a previous save it becomes your current save, and your old current save becomes the previous save. Basically your saves swap names, you can verify this with the time stamps.

    If you get killed (see the save icon, or get an instant death) the current save will get a death. Your previous save will still be death free. This allows you to load the previous save and continue your death free run. But now the save you died on becomes the previous save. So if you get killed again before you can make a new save, you will have deaths on both saves and fail the achievement. You can still reload your current save if you're about to die, but you can't actually die.

    I would also like to note that killing aggressive humans does not void this achievement. If you kill a non aggressive human it will count as a death, so just load your previous save and go about your business.

    This is actually a very simple achievement once you understand how the deaths/saves work. Always try and remember where your previous save was made, and if it was in a dangerous situation try to make two saves at the next safe registration point.

    Also I got this achievement playing on novice on my second play through.

    UPDATE: thank you to @Zordnil for confirming that you can reload the chapter save if you happen to get deaths on both saves. You must replay/play all chapters from that point for the achievement to still unlock. Would also like to note that the solution by @IIKazzII also explains this.

    I hope that all makes sense and happy hunting.
    Showing most recent comments. View all comments.
    ZordnilLost concentration (tired) and died when i was too slow with the generator. Read this guide after playing through to the next chapter so previous save wont help me. Trying the mission save but i dont have my hopes up.
    Posted by Zordnil on 17 Oct 15 at 22:44
    ZordnilI just finished the game and i got the achievement! So if you have no deaths up to a certain chapter you can reload a mission save and play from there. :)
    Posted by Zordnil on 18 Oct 15 at 14:18
    GinzoyelReally hope you're right mate. I just died on Mission 12 on Hard Mode with no deaths so far, going for a One Shot run and getting all achievements in 1 go. I messed up the disconnect routine for turning off the power in the right order. I accidentally loaded my current save and then by mistake saved 2 more times before realizing I had died in the previous area. So I went into Mission 13 and realised right at the beginning I had died last mission and completed it. I just re-loaded Mission 12 and I am going to complete it again, I hope to god that it does not count...

    EDIT: Yep I got it! So re-loading the entire mission that you died in, from the beginning and finishing it without dying doesn't void your "One Shot" chance.
    Posted by Ginzoyel on 28 Aug 20 at 11:59
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