Serious Sam: Siberian Mayhem

Found a really good trick that will definitely help you.

Once you get the double shotguns (wave 4 around 3 min i believe) you can open the skill menu by pressing left on dpad and remove the double shotguns skill (dont worry you will keep the double shotguns in hands).
Now use the skill point you just got on the skill "enemies will sometimes drop loot when killed". you now have a chance to get extra armor/health.

I got it first try after finding out this trick. you will still need to practice and you will die a lot, but it will definitely help you survive longer once you get used of a route you like. also i noticed running close to the walls instead of middle of corridors give more chance of not getting hit.

Good luck you will get it!

This is what worked for me:

Follow the movement pattern in this (short) video. The default path is 0:03 to 0:17. Whenever the path is blocked by Kleers, use the alternate paths shown in the video. Keep trying until you succeed.



Despite being marked as "medium" difficulty in the game, this is the hardest survival challenge by a rather large margin. And by far the hardest Achievement in the game. Completion ratio is currently only 0.03%.

I don't know if this is intentional, or if the developers messed up and accidently made this challenge a lot harder than intended. I completed all the other survival maps within roughly two hours, earning a gold medal on the first try on the last map. But it took me four days to finally earn a bronze medal on this map.

There are a few gold medal runs on Youtube, but they aren't very helpful. They all recommend playing aggresively and kill the Kleers as soon as they appear, in order to avoid being swarmed. But I spent three days trying to do that, and my average survival time was something like 1:30. The Kleers spawned faster than I could kill them no matter what.

Once I stumbled upon the above path however, my average survival time greatly increased, and I got the bronze medal within roughly half an hour.

I hope this is helpful.

Superior Species: Get any medal on Kleer Fortress survival level (15G)
Unlock Percentages: 0.04% (at the moment)
After 12 hours of Running, Killing, Dying and Break times, I finally got this!
Here's some tips:

-RUN! Run for your Life! just RUN! these are Kleers we are talking about!

-Turn, as one old school Serious Sam player I said! Kleer have 3 type of attacks such as: normal melee, ranged, ram-jump, first two isn't an issue here but the third one, as long as Kleer move speed was always faster then Sam, they Ram you eventually, so Turn, Turn as much as you can, do you hear me? TURN!

-Whenever the Path is blocked by Kleers, use the alternate path

-Forget about upper path, you need more turns, way more turns, you need to use my main path to get one general idea from it but not exactly that one, my turns are not enough

-Look at it as sort of Need For Speed game :| yeah right! you have to make LOTS of "Near Miss" and lose opponents in the Turns

-Kleers are Not random spawn! they came at one specific order, so learning it may help you

-What "oONeonDemonOo" said will help you, but as he/she said "good trick that will help" not Solve it, because from 0:00 to 3:00 is the first half of Nightmare, and 3:00 to 4:30 is the second half of Nightmare, so it definitely helps you, but don't count on it cuz it's "occasionally drop" and it's not much

Feel free to check his/her solution in other guide
Inspired by oONeonDemonOo:
"Once you get the double shotguns (wave 4 around 3 min I believe) you can open the skill menu by pressing left on dpad and remove the double shotguns skill (don't worry you will keep the double shotguns in hands).
Now use the skill point you just got on the skill "enemies will sometimes drop loot when killed". you now have a chance to get extra armor/health"

It wasn't that hard :| I could make 5/6 minute solid!

Unfortunately, there is no surefire and easy way to unlock this achievement. However, there are some precautions that you should definitely follow.
- Remember the order in which enemies appear.
There is no random element in the order of appearance of Kleer Skeleton. perhaps. Memorizing it will be very helpful in your strategy.
- You need to run all the time.
When you return the stick to neutral, it will return to walking mode. Always keep the stick down and in running mode.
- You should not avoid combat.
You need to kill as many Kleer Skeletons as possible while continuing to run away. Please actively convert enemies that can be defeated while running into dog treats.
- Don't let your guard down even with Dual Wield
Once you get the skill in WAVE4, you can win by just surviving for a little over a minute, but don't forget that if you let your guard down for just one second, you will die.
- Don't run in the middle of the aisle
Please run to either the left or right. Increases the chance that enemy attacks will miss. Ideally, if you plan to turn right next time, staying to the right will likely yield better results.

that's all. I wish you good luck.