How do I get the ''Running Zombies'' unlockable ?

[Eazy-E]

I've been noticing there is apparently an unlockable I still haven't acquired after playing both the game modes on Hardest and Last Stand and I can't seem to find out how it can be unlocked .
I've seen an unlockables related thread but it doesn't seem to be very accurate .
What am I supposed to do to unlock the running zombies ?

[fisch]

what do you mean exactly? i don't see anything that says "running zombies" in the game.
either way, best bet is to probably google it to get a better answer. xx

[Eazy-E]

I believe there's an unlockable that's ''Running Zombies'' or something like that ?
Whatever it is , I have all the unlockables but the last one counting from above and I can't find a way to get it .

[fisch]

oh. huh. idk then. you might have to take the discription of the acheivement and try to guess. wish i could help. xx

[Eazy-E]

I am seriously getting tired of this .
Swear I've done every single possible thing in the game .
I've done The Solution and the normal game like a thousand times in every difficulty .
Last Stand , both modes ...
Got all the achievements ...
And yet I'm still missing the last unlockable .
...Help ?

[fisch]

Opprinnelig skrevet av Eazy-E:

I am seriously getting tired of this .
Swear I've done every single possible thing in the game .
I've done The Solution and the normal game like a thousand times in every difficulty .
Last Stand , both modes ...
Got all the achievements ...
And yet I'm still missing the last unlockable .
...Help ?

Running Zombies mode
Successfully complete The Solution campaign to unlock Running Zombies. Note: Enabling this mode prevents achievements from being earned.

Source: http://www.cheatcc.com/xbox360/deadpixelscheatscodes.html

[Eazy-E]

Opprinnelig skrevet av 「 柳 」:

Opprinnelig skrevet av Eazy-E:

I am seriously getting tired of this .
Swear I've done every single possible thing in the game .
I've done The Solution and the normal game like a thousand times in every difficulty .
Last Stand , both modes ...
Got all the achievements ...
And yet I'm still missing the last unlockable .
...Help ?

Running Zombies mode
Successfully complete The Solution campaign to unlock Running Zombies. Note: Enabling this mode prevents achievements from being earned.

Source: http://www.cheatcc.com/xbox360/deadpixelscheatscodes.html

...
I've done The Solution ♥♥♥♥♥♥♥♥ times in co-op and single player ...
... that information is wrong .

[Eazy-E]

Somehow I just misteriously unlocked ''Running Zombies'' .
My bet is it's unlockable upon getting all achievements since I just recently did that . Then again , it only unlocked after a couple of ''go's'' at the game .