Left 4 Dead 2

Left 4 Dead 2 Achievements


Play 6 Mutations.

Mutations is a new game mode where regular games will be altered from their previous rules. This game mode will be updated weekly by the developers so you will need to play at least one game a week through the Mutations option every week for six weeks.

Complete six of these game alterations and the achievement will unlock.

This game mode will be updated every Friday of each week. Make sure you check the blog posts on the title screen on a regular basis to keep up to date with the current Mutation game alternations.

Rate this achievementAverage Rating (Based on 13 votes)
User Comments
Comment #1 by cosmicsemone
Tuesday, November 30, 2010 @ 09:43:10 PM

30g but simple just play a mutation every week including the permanent realism versus i didnt know til i played it and unlocked it

Comment #2 by DT2
Friday, December 17, 2010 @ 03:18:20 PM

What a crappy idea for a cheevo. Now it's every two weeks! I hope no one else adopts this tactic with their cheevos!

Comment #3 by Snix
Friday, January 14, 2011 @ 11:03:01 PM

I've played well over 10 different Mutations, It doesn't always count toward my total. I've been attempting this for months now!

Comment #4 by bsteve92
Monday, January 17, 2011 @ 08:49:12 AM

yeah same here why doesn't this work

Comment #5 by sicktatsbro
Sunday, January 30, 2011 @ 03:01:44 PM

If a mutation doesn't count, try this: After you play the mutation, jump into a quickmatch of Realism vs. You should get credit for the mutation.

Comment #6 by Capt AwesomeDP
Wednesday, February 02, 2011 @ 07:06:31 PM

THANKS CLEETUS!!! This works, i just got the achievement it glitched out on me after 5 mutations.

Comment #7 by GhostSniper3
Saturday, April 02, 2011 @ 02:57:29 PM

I played it once and got 1 but the rest of the times i played it it didnt count

Comment #8 by Snix
Friday, April 22, 2011 @ 10:05:49 PM

@5 (cleetus)
thanks heaps man, that actually worked! I started playing last week and my total went from 4/6 o 5/6, so I assumed it would work this week too. It did not. I played 3 games of Mutation, and nothing. I loaded up a local Realism Versus (using a second controller) and it finally unlocked. Whats odd is it didn't unlock until a few minutes into the RV match, and the Avatar Item (Gnome Chompski) actually unlocked first. Either way, thanks heaps.

Comment #9 by OSUSmitty10
Saturday, May 21, 2011 @ 04:22:33 PM



Comment #10 by sweatycrisis
Tuesday, May 31, 2011 @ 08:50:44 PM

Thank you #5.

Comment #11 by Darkforce412
Sunday, June 12, 2011 @ 12:38:21 PM

well didnt work for me but thanks anyway

Comment #12 by Broady
Tuesday, June 21, 2011 @ 01:06:24 AM

Thanks #5.

Comment #13 by B O W147
Friday, June 24, 2011 @ 06:28:34 AM

Ive got one more too do i did it but it still doesn't work and ive tried the realsim vs and it wont count it
can anyone help

Comment #14 by CMW43
Saturday, July 09, 2011 @ 08:56:40 PM

i cant get it

Comment #15 by Roller720
Tuesday, August 09, 2011 @ 02:21:47 PM

The mutations are now changed around every two weeks I think.

Comment #16 by Rob11693
Friday, August 12, 2011 @ 09:21:42 PM

Thanks cleetus!!!

Comment #17 by Aeon7936
Thursday, August 25, 2011 @ 03:29:28 PM

Curious, I could have sworn its hit the two week mark, anyone got a little more info on this finished all my lfd1 acheevos and soon will be with prt2, if anyone can help me understand how mutations work (schedule wise) it'd be greatly helpful.

Comment #18 by L1E
Sunday, September 04, 2011 @ 03:23:06 PM

Alright, this sucks. I've been trying the Realism VS thing, and it still doesn't count. I've been stuck at 4/6 for the past two mutations, I should have it by now. But, nope.

Comment #19 by Boba Fett
Monday, September 05, 2011 @ 11:28:56 AM

I was using the trick Cletus pointed out, this worked before... however I believe these douches bags some how patched this, so now there is no way to get this achievement. I've honestly been trying at this for two months or so now. If you played an entire mutation start to end and jump in to a quick match of realism vs and I would be giving the credit. Now that I'm one f'n credit away from unlocking this it just stops working. I've tired playing several mutations in a row then playing a realism vs quick match and it still hasn't worked. I'm going to try to dick around with this a couple more times hopefully I can find a way to make this work. If anyone has any input in how this can work now please share anything you may have that would be of use.

DX Aeon, the mutation schedule is set

Comment #20 by Boba Fett
Monday, September 05, 2011 @ 11:30:54 AM

DX Aeon, the mutation schedule is set as so. Every two weeks (every Friday) they'll be changing it, it used to be a weeks wait time now it's two... but this achievment isn't even working anymore so I don't know if my telling you this will really matter. But hey if it does work let me know

Comment #21 by Aeon7936
Friday, September 09, 2011 @ 03:54:51 AM

Ugh, it switched finally, but I'm there with ya guys, stuck at 4/6 and played countless games start to finish, did the realism stuff, cleaned my cache... everything.... I managed to getall my l4d1 achievements and only 5 away from maxing 2... suckage... thanks though for the reply :)

Comment #22 by Boba Fett
Monday, September 26, 2011 @ 12:50:44 PM

Yes!!!!! Finally after months of trying and I finally got this God forsaken achievement! I believe they may have actually patched the problem, so you may no longer have to play a mutation then a realism vs match right after to get credit for the mutation from what it looks like. I had 5/6 for the longest time, I signed in the other night with my buddy and as soon as the mutation loaded it popped up, seconds later the pop up for the avatar accessory came. Yes Gnome Chompski, I've finally captured you!!! ^_^

Now tell me where the rest of the underpants gnomes are, and where the fuck have you been taking my boxers?!

Comment #23 by DaveGee
Thursday, October 13, 2011 @ 09:43:55 AM

I played Gib Fest and my achievement never popped up! I was at 5/6 too! GRRRRRRRRRR

Comment #24 by tubawx21
Sunday, October 23, 2011 @ 11:05:01 PM

I didn't get credit for playing Gib Fest either. I'll fire it up and see if the latest is working.

Comment #25 by tubawx21
Sunday, October 30, 2011 @ 06:52:16 AM

I got credit for playing the one released Oct. 21. I had to play it twice as my system locked up during the first play through (RRoD incoming). The tally updated while playing the second time.

Comment #26 by zecmo
Sunday, October 30, 2011 @ 11:10:08 PM

I finally got credit for this achievement with this week's mutation: IronMan. I don't know of this is a new game type, which may have done I for me, or if Valve fixed something. Either way, I'm happy it finally popped and I figured i'd mention so maybe it'd help some other frustrated soul.

Comment #27 by UglyEight7785
Saturday, November 26, 2011 @ 11:31:40 PM

I am doin something wrong. I play Mutation, then Realism vs, and only 2 of my Mutation attempts counted. Do you have to play a certain amount of time in Mutation?

Comment #28 by GalaxyCrusher
Wednesday, January 18, 2012 @ 11:47:20 PM

Is it me or has the same mutation been going for more than two weeks now amd I'm stuck 4/6!?! Are they even going to bring in new mutations in anymore?

Comment #29 by SchiZoPHreNiikz
Monday, January 23, 2012 @ 05:57:04 AM

It feels like it would never leave!

Comment #30 by Seblefeu
Monday, February 06, 2012 @ 07:06:53 PM

The mutation change each 3 weeks

Comment #31 by celebifan251
Thursday, February 09, 2012 @ 04:52:53 PM

I think it doesn't work because a bug or you just can't do a mutation you've already done, but Steam says its because they had "Community Mutations" not "Custom Mutations" that you actually need for this achievement. if you go to the Left 4 Dead 2 Wikia, it'll tell you all the original mutations and if you're playing a "Community" one or not. But I hope I don't run into any problems because I'm just starting this achievement and God, I am NOT joining a realism versus to get this!!! I don't care if it works, I'm not prepared get my ass handed to me by a bunch of 30 year olds who have played L4D2 forever and are on the enemy team.
I hope that sort of helped.

Comment #32 by Zebranips
Monday, March 19, 2012 @ 11:08:30 PM

I can verify the glitch/trick #5 suggested sttill works i got my achievement today.i was 5/6 then I played a mutation and it didn't unlock then I just joined a realism vs and it unlocked.

Comment #33 by jacksteranddh
Tuesday, May 01, 2012 @ 02:09:42 AM

why hasnt the mutator changed in the past 2 weeks? I only need 1 more

Comment #34 by jackster and dh
Friday, May 04, 2012 @ 06:25:09 PM

ok this is pissing me off. It's been 3 weeks and I only need one more mutator... does anyone know when it's going to change?

Comment #35 by avidgamer91
Sunday, June 17, 2012 @ 11:04:20 AM

^Same. I've had 5/6 mutations for months now and I still don't receive credit for playing new mutations.

Comment #36 by Punkie Muffin
Sunday, June 24, 2012 @ 11:38:14 PM

I can verify that the Realism Vs. glitch still works.

Comment #37 by DarkMBizzy
Wednesday, July 04, 2012 @ 12:23:03 PM

I have had 5/6 for the past three months and the Realism Vs. glitch is not working. Any suggestions?

Comment #38 by DarkMBizzy
Wednesday, July 04, 2012 @ 12:29:25 PM

Nevermind it just unlocked with this mutation(:

Comment #39 by uratitmouse
Friday, July 27, 2012 @ 02:36:39 PM

mine also keeps saying 5/6 there a trick or something?

also anyone want to help with some of the achievments im willing to help back

GT uratitmouse

Comment #40 by Path to Decay
Tuesday, July 31, 2012 @ 05:24:33 AM

Guys. Don't worry about it not changing. August 31 and I noticed it just changed from last time I checked back in July.

Comment #41 by Path to Decay
Friday, August 03, 2012 @ 02:44:15 PM

July* and now you can just change it yourself by going to mutation and pressing (Y) at the menu to change the mutation.

Comment #42 by The Lucifer
Wednesday, August 15, 2012 @ 11:50:54 AM

After the new update you can unlock "Mutant Overlord" Achievement in less than 5 minutes . cycle through all mutation by pressing "Y" start a private game , exit and play another Mutation , do that 5 times and ACHIEVEMENT UNLOCKED + GNOME AVATAR AWARD which is awesome

Comment #43 by TheHackerEG
Monday, August 27, 2012 @ 05:33:55 PM

I have 2 questions. Do you do purchase the DLC to play Mutationts? And do you have to be a Gold member or can you be a Silver one ?

Comment #44 by dewst
Monday, March 04, 2013 @ 04:25:30 PM

I've probably played over 30 mutations and I've been at 4 for over 6 months..

Comment #45 by Nerdie4U
Sunday, September 22, 2013 @ 06:12:23 PM

ok not sure if doing this wrong but i keep playing and finishing the round with a certain mutation but then it stopped moving up at 2, i dont know why i wont let me do the others. any help?

Comment #46 by MIKE1989TW
Sunday, October 13, 2013 @ 09:39:28 AM

This achievement took me a long time to get. When at the main menu press Y when highlighting 'Mutation' and it will scroll through all the various games. I got 1 tick then played again, no tick? Valve have stopped making new Mutations but released 1 new one every few weeks when the game was new(ish). I have since realised you need to play different Mutations but also every three weeks, I.E..
1) Gib Fest, then 3 weeks later;
2) Last Man on Earth, then 3 weeks later..
You do not even need to complete the Mutation, just load it then hit start and quit, you will see a tick on your list of 6 Mutations in the achievements list at the main menu.

I only need Heartwarmer and Strength in Numbers..if your up for doing these add me: MIKE1989TW

Good Luck!!

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Game Info
Electronic Arts


US November 17, 2009
Europe November 20, 2009

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