Serious Sam: Siberian Mayhem
51 Achievements
GOG
Massacre Party
Complete Siberian Mayhem on Serious difficulty in Cooperative with enemy multiplier set to at least x2
Epic
0.8%
How to unlock the Massacre Party achievement in Serious Sam: Siberian Mayhem - Definitive Guide
Fooga
TrueAchievements
TrueAchievements
25 Oct 2022 04:56
This achievement, as of 4/18/2024, is FIXED!
You can do this in co-op by yourself, and you should, as it only unlocks for the host. It is easily done by going to Multiplayer and in Custom options, set the enemy multiplier to x2, you DO NOT have to alter the enemy strength percentages. You can put on unlimited ammo, and give yourself unlimited respawns, as well as temporary invulnerability. Having unlimited ammo and gadgets mean you'll eventually complete this just ramming through it.
Some tips:
-If you're impatient like me, you can spam the Serious Time and Serious Rage gadgets and run past enemy spawns, and then spam things like the Companion Drone, Black Hole, and Nuke on parts where you are forced to kill enemies. As the game is only 5 missions long, this makes the game about 90 minutes. This does slow down your game and could possibly cause a crash, so be warned. Swap your game to PERFORMANCE mode to decrease the chances of crashes, as this game doesn't run very well on console (even on Series X).
-Has to be done in one go. If you disconnect or crash, it must be redone.
-Recommended as a second playthrough so you know where the better gadgets and weapons are, and you can endlessly use these with unlimited ammo!
-Mission 4 has an issue at the end train section where if you kill enemies too quickly it'll just have you sit there with no more enemies to kill. THIS IS NORMAL. I had this happen on both the console and PC version, and sitting there for a few minutes will eventually force the game to continue (you'll hear dialogue and be able to board the train).
Old Solution (if someone is randomly curious to read how long this took to get fixed lol):
You can do this in co-op by yourself, and you should, as it only unlocks for the host. It is easily done by going to Multiplayer and in Custom options, set the enemy multiplier to x2, you DO NOT have to alter the enemy strength percentages. You can put on unlimited ammo, and give yourself unlimited respawns, as well as temporary invulnerability. Having unlimited ammo and gadgets mean you'll eventually complete this just ramming through it.
Some tips:
-If you're impatient like me, you can spam the Serious Time and Serious Rage gadgets and run past enemy spawns, and then spam things like the Companion Drone, Black Hole, and Nuke on parts where you are forced to kill enemies. As the game is only 5 missions long, this makes the game about 90 minutes. This does slow down your game and could possibly cause a crash, so be warned. Swap your game to PERFORMANCE mode to decrease the chances of crashes, as this game doesn't run very well on console (even on Series X).
-Has to be done in one go. If you disconnect or crash, it must be redone.
-Recommended as a second playthrough so you know where the better gadgets and weapons are, and you can endlessly use these with unlimited ammo!
-Mission 4 has an issue at the end train section where if you kill enemies too quickly it'll just have you sit there with no more enemies to kill. THIS IS NORMAL. I had this happen on both the console and PC version, and sitting there for a few minutes will eventually force the game to continue (you'll hear dialogue and be able to board the train).
Old Solution (if someone is randomly curious to read how long this took to get fixed lol):
This achievement, as of right now, is unobtainable. This is due to the option of multiplying enemies not currently being present in the console version of the game. I’ve contacted the developers if this will be added or the achievement requirement will be changed, as I suspect this feature was not included for performance reasons.
Update 10/25/22: I got a response from a dev on Steam and they are aware of the issue with the multiplier not being in the game and it making the achievement unobtainable. They’re working on a fix, but no time estimations yet.
Update 12/21/22: I asked the dev for an update and got this:
Update 8/12/23: The dev said they attempted to contact Microsoft and Sony to get the achievement/trophy removed but was denied. They also said they tested the x2 multiplier and it was fine for consoles, they just need to patch it in. Unfortunately, this patch likely won't happen until after The Talos Principle II is released, as they are working exclusively on that atm (at the publisher's behest).
Update 2/7/24: After a long stretch, the dev sent me this:
Update 10/25/22: I got a response from a dev on Steam and they are aware of the issue with the multiplier not being in the game and it making the achievement unobtainable. They’re working on a fix, but no time estimations yet.
Update 12/21/22: I asked the dev for an update and got this:
“Hey. I'm sorry, unfotrunately there are things that don't let us update the console version for a while. We will try to fix this eventually, but it's not happening anytime soon :(“
Update 3/3/23: Asked the dev for another update and he stated it will likely won't be updated until the latter half of the year.Update 8/12/23: The dev said they attempted to contact Microsoft and Sony to get the achievement/trophy removed but was denied. They also said they tested the x2 multiplier and it was fine for consoles, they just need to patch it in. Unfortunately, this patch likely won't happen until after The Talos Principle II is released, as they are working exclusively on that atm (at the publisher's behest).
Update 2/7/24: After a long stretch, the dev sent me this:
"Hey man, to update you on the topic - the patch is being worked on now. Deployment is troublesome here so I dont know if it's going to take a day or a month, but it should be done at some point."
Update 4/18/24: The developer updated me to let me know the update has been released! Achievement fixed!
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25 Oct 2022 04:56
74 Comments
Well it’s 2023 now lol guess they’re too busy working on the next broken game!! Lol
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By Hitman Darkness on 05 Jan 2023 08:53
I messaged them on the 20th for an update and just checked them after I read your comment, so that’s my bad on not getting the update out quicker. But they did respond and it seems this is going to stay unobtainable for a while. I updated the solution with their message. Hopefully they eventually fix it.
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By Fooga on 05 Jan 2023 09:04
Thanks for the update Fooga.
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By The Last Rascal on 10 Jan 2023 23:05
Still no fix! Games on sale Blah pass!!!
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By Hitman Darkness on 14 Feb 2023 21:41
Когда исправят?
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By Minenko Sergey on 17 Feb 2023 17:12
Finally...... I was about to uninstall it yesterday but some how I didn't! I thought it never getting fixed, but happy to devs didn't forget about it after all.
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By DD3FAULT on 19 Apr 2024 08:22
Fooga, good job maintaining communication and efforts to get this sorted!
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By Law Violation on 19 Apr 2024 20:11
The achievement tracker for this achievement has raised from 0.00% to 0.02%, could be a dev testing a new patch or someone could have found a workaround in some way?
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By aps42 on 01 Mar 2023 10:34
👀
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By Silver Salvo on 01 Mar 2023 20:19
Likely testing. I’ll message the dev again and get us an update.
Edit: Dev said it was likely someone using an unlocker as to his knowledge it isn’t on console yet. I asked for a time frame or estimate of when we’ll be able to officially unlock this and I’ll update the solution when I get a response.
Edit: Dev said it was likely someone using an unlocker as to his knowledge it isn’t on console yet. I asked for a time frame or estimate of when we’ll be able to officially unlock this and I’ll update the solution when I get a response.
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By Fooga on 01 Mar 2023 20:21
Glad to see it's at least on the radar for them. Thanks again for the update Fooga!
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By The Last Rascal on 06 Mar 2023 18:23
isn't it ridiculous to keep an an achievement that is unobtainable honestly? if the devs cannot make it work, why is it here in the first place?
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By GregTopz on 12 Mar 2023 13:16
Any news?
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By Tomassir on 07 Jun 2023 06:01
I’ll post updates as soon as I hear them. Promise! I’m checking all the time.
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By Fooga on 07 Jun 2023 06:20
Maybe since it's coming to Game Pass they'll try harder to update it, so they don't turn away achievement-hunters who avoid games with unobtainables?
Maybe I'm just an optimist.
Maybe I'm just an optimist.
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By ALoneWolf42 on 18 Jul 2023 19:05
Developer gaslighting 101. Some of them are not worth their weight in 💩. They put it in knowing full well..... Then they clamber on about patching for 18 months. All while knowing it's a problem.
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By Twigleaf Twigs on 20 Jul 2023 21:31
this shit coming to gamepass with unobtainables looool
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By S GT on 22 Jul 2023 13:47
Give it 2 weeks after it's on gamepass. They will fix it eventually.
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By Aphelion Rem on 24 Jul 2023 05:33
I bet they never do. At this point likely onto another game.
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By EazyE2285 on 25 Jul 2023 22:22
So I was told just not that it likely won't get patched, but they're going to "try something" and let me know. 
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By Fooga on 26 Jul 2023 00:14
I'm not sure it is. They have to go through Microsoft for that. The fastest solution would be for them to just put the multiplier in.
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By Fooga on 26 Jul 2023 22:12
This sucks, cuz i reealy want to play this game.
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By ZigsterLV on 27 Jul 2023 03:32
Well worst case if you have a decent PC you can do that version. That list is 100% obtainable.
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By Fooga on 27 Jul 2023 04:03
Super annoying don't have a pc that can run this and serious sam is one of my favorite series guess I'm gonna play through it on a dummy
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By Bk LuCKY ChaRMS on 27 Jul 2023 05:00
Them adding it to the windows version , adding both versions to game pass , and not fixing this first is all 1 big kick in the teeth. they clearly don't care about it.
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By Lost Legends on 31 Jul 2023 01:05
someone unlocked it
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By TheOnlyMatto on 01 Aug 2023 20:11
It's been "unlocked" on xbox for a while. It isn't legitimate.
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By Fooga on 02 Aug 2023 09:23
Would a change to the requirement be easier than adding the Multiplier? Seems odd it's not present on the Xbox version.
I suppose as an alternative, they could amend the requirement to finish it in Co op with the enemy Strength set to a certain %.
I suppose as an alternative, they could amend the requirement to finish it in Co op with the enemy Strength set to a certain %.
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By Law Violation on 12 Aug 2023 08:14
I updated the solution and passed your recommendation to them, Law. That seems like a good alternative.
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By Fooga on 12 Aug 2023 08:42
15 Aug 2023
.
I commend the diligence to contact developers and updating here for a year.
Thanks.
While not technically a guide, it definitely saves us time and informs us of the sadness that all achievements cannot be unlocked.
Thumbs up #5.
.
I commend the diligence to contact developers and updating here for a year.
Thanks.
While not technically a guide, it definitely saves us time and informs us of the sadness that all achievements cannot be unlocked.
Thumbs up #5.
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By E vee dub on 15 Aug 2023 11:39
Fooga, you're a legend! I check this page every couple of weeks to see if there's any good news, but regardless of it's absence, I genuinely appreciate the fact you're taking the time to try and get it sorted and keep everyone up to speed. Thanks!
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By IVIr IVIeNsA on 23 Aug 2023 04:34
No problem! I love the Serious Sam series so I'm pretty invested, plus I hate seeing such a great game likely skipped by many because of the unobtainable. The dev I've been talking to is honestly a nice guy and seems like he wants it fixed but their publisher is really giving them shit for Talos. I have faith it'll get fixed eventually.
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By Fooga on 23 Aug 2023 04:43
I always expect to check back and get bad news, so hearing there's a decent chance is solidly in the good news camp.
Thanks as always Fooga!
Thanks as always Fooga!
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By The Last Rascal on 10 Sep 2023 07:12
a cheater unlocked it, reported success
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By OxVOLVAGIAxO on 14 Sep 2023 18:42
Yep confirmed it just in case. Multiplier still isn't present.
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By Fooga on 18 Sep 2023 06:48
Is this working on the windows version ?
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By SwitchingRain57 on 26 Sep 2023 03:27
Yeah. The multiplier is just removed from the console version.
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By Fooga on 26 Sep 2023 15:55
any tips for people on pc? does just doing the last mission with said requirements unlock it or is it the whole campaign?
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By Vr46A13TT on 11 Oct 2023 00:43
I'm actually not sure. Second Encounter's coop achievement needed to be done from the beginning so that's what I did for the PC version. If you want to confirm if it just needs to be the last mission, go for it. I'd appreciate it actually. 
Other than that, if you do have to do the whole thing, it's quite easy with unlimited respawns and ammo.
Other than that, if you do have to do the whole thing, it's quite easy with unlimited respawns and ammo.
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By Fooga on 11 Oct 2023 02:37
3 gamers have this achievement already, so maybe they are testing this.
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By Slugger Maxman on 06 Nov 2023 11:16
Thanks for the updates. Maybe get them to lower the standard of the achievement to just starting the game or something like they did in COD BO4 for a very difficult achievement,
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By CoiledRook16981 on 06 Nov 2023 22:25
Hey Fooga,
it appears they have shutdown the servers on the windows version of the game.
Can anyone create a co-op session?
Can you try and contact the devs if it's true?
it appears they have shutdown the servers on the windows version of the game.
Can anyone create a co-op session?
Can you try and contact the devs if it's true?
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By jc colding on 06 Dec 2023 11:46
Anyword on this patch yet
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By JoNNy BoJanGls on 23 Dec 2023 16:03
They said they wanted to look into it after they had Talos 2 squared away, but I haven't messaged them lately. I'll wait until after the holidays to check up on it. 
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By Fooga on 24 Dec 2023 10:25
I don’t think a patch is going to happen!
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By Hitman Darkness on 28 Dec 2023 22:18
Thanks for the update.
I'm using seriesS. I restarted the game 4 times before I unlocked the achievement. I was really annoyed when I crashed at the final boss, but I managed to get through it.
I'm using seriesS. I restarted the game 4 times before I unlocked the achievement. I was really annoyed when I crashed at the final boss, but I managed to get through it.
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By Dolphinist77 on 05 May 2024 07:30
Oof. Sorry to hear that but glad you got it. It crashed on me once doing the snow map on Series X and I was sweating doing the second to last level.
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By Fooga on 05 May 2024 22:47
turn off dismemberment and blood. This will also reduce the risk of crashing. Too much meat on the screen also stresses the system
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By Mephiles on 19 May 2024 10:08
I did not have to do it in one go. I got to the last level and the gate did not unlock after the massive waves of enemies. I returned to the menu then just replayed the last level, and the achievement unlocked.
From what I could see in the co-op menu, the game saves your highscore after every level. Judging by that I assume you can do it one level at a time.
From what I could see in the co-op menu, the game saves your highscore after every level. Judging by that I assume you can do it one level at a time.
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By HappyTheDevil on 10 Jun 2024 12:28
Good to know. I'll update the solution. Thanks!
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By Fooga on 10 Jun 2024 20:33
Good job getting it fixed, I may finally start this... Some day
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By thatNoseyParker on 12 Jun 2024 01:02
Hopefully this gets fixed this is a game I really wanna play
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By Bk LuCKY ChaRMS on 01 Apr 2023 04:28
Nope. Those are just cheaters.
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By Fooga on 06 Nov 2023 19:38
i dont think they will fix it either sadly :/ looking like ill play it on a diff acc SP looks very fun
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By EMBICK on 08 Jan 2024 08:05
any update?
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By LiamtheDream on 28 Feb 2024 22:50
Figures
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By JoNNy BoJanGls on 04 Mar 2024 05:16
do i need pcmr to play this on pc i have a laptop i paid 1100 usd for im wondering if it will play this game its a dell inspiron 17 7000 2 in 1 not a gaming laptop if that helps plz
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By EMBICK on 12 Mar 2024 22:37
You should be fine. Just lower everything graphically just to be safe. I got my laptop in 2016 and it got the job done.
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By Fooga on 13 Mar 2024 01:46
thanks a lot will give it a go mine is like a 2020
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By EMBICK on 14 Mar 2024 07:21
so is it safe to assume this will never get fixed? bit of a shame but still fun game overall. after doing serious difficulty with infinite ammo i thought it may actually be even more fun with 2x enemies lol
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By GregTopz on 03 Apr 2024 05:47
Attention attention!!! an update has JUST arrived!!! about 6 minute ago or so, it's 19.4GB, I personally didn't update yet so I Cannot confirm this yet, but I assume it getting fixed... hope so... if so, count me in...
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By DD3FAULT on 18 Apr 2024 18:33
Yes. Just wanted to confirm the developer messaged me earlier today and said the update was out on Playstation and they were going to get back to me if it was on Xbox. As DD3FAULT has stated, it is also out now for us as well. They only added the x2 multiplier, but this is enough to finally unlock this achievement.
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By Fooga on 19 Apr 2024 03:11
nice, im glad they finally fixed it
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By GregTopz on 20 Apr 2024 06:44
NO. FREAKING. WAY.
Great news, thanks as always Fooga!
Great news, thanks as always Fooga!
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By The Last Rascal on 20 Apr 2024 21:35
With the unlimited instant respawn setting you don't really need the gadgets but I still picked up the black hole because it takes ages to kill the enemies on the last level. If you set the respawn invincibility to 10 secs (heavily advised as you may end up in situations where dozens of enemies bite you right after respawning) You can run through most of the non arena parts of the levels. Don't forget You have to destroy all the towers except the second one to be able to progress.
Oh, another thing: I did run into a bug a few times on my first playthrough where enemies spawned out of bounds and softlocked my progress. This also happened to me once on my Co-Op run. Thankfully there is a failsafe implemented in the game. If there is no fighting for around 10 minutes, the game finishes the battle. So don't quit if you run into the same situation.
Oh, another thing: I did run into a bug a few times on my first playthrough where enemies spawned out of bounds and softlocked my progress. This also happened to me once on my Co-Op run. Thankfully there is a failsafe implemented in the game. If there is no fighting for around 10 minutes, the game finishes the battle. So don't quit if you run into the same situation.
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By HUN playmore on 24 Apr 2024 20:40
Don't hold the xbox button or the controls will stop working. If you are playing by yourself you will need to restart
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By Maughty Bear on 28 Apr 2024 07:06
just did this on series S (performance mode) had some sketchy moments near the end where im pretty sure the framerate went into single digits but somehow pulled through without crashing lmao
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By GregTopz on 28 Apr 2024 08:26
Just did an online session of the whole game in one sitting as the joining player. Only the host popped the achievement.
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By Nesmaster on 30 Apr 2024 23:29
Damn. Not something I considered as it's very doable solo, and when I had attempted it in co-op, it was unobtainable. I'll be sure to add that to the solution.
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By Fooga on 01 May 2024 01:14
He is right, only host popped the ach. But when i loaded last level in coop, i also got the achievement.
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By Savenal on 03 May 2024 12:57
I think, windows version has the same issue
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By Savenal on 03 May 2024 13:09
Woohoo cant believe it was addressed now i can 100
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By ToMiSIav on 04 Jul 2024 14:20
im still baffled at the high ratio for this. its literally the most brainless run on the game. i did the PC version today for this one and it took me under 2 hours, even fell half asleep at some point lol
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By GregTopz on 08 Jul 2024 17:50
Gamepass boost. This applies to almost any game on there
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By HerrKätzchen on 19 Jul 2024 09:52
