The secret achievements recently hit the web this week but before we go any further, consider the possible spoilers ahead.

Ten of the recently leaked secret achievements happen to be related to the new Extinction mode which might offer some clues on what the new mode is all about. What’s interesting is that four of the ten “Extinction Challenges” have the word “Escape” in it…

And is it just me, or does this look like some type of Alien skull?

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The unique skull above is featured in a couple of the achievement icons. Another noteworthy achievement is “Any Means necessary” which you unlock by “Get 50 kills with the electric fence and fire traps in a single game.”

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You can see the rest of the secret achievements over at Exophase.

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SOURCE: Exophase and TwinStick Gaming

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