In order to get this achievement, do you have to survive everything Base has to offer? Or amass a certain amount of points? I'm really confused about this one.

I played "Base" and got to the 4th skin and got jammed. So how do you go about this? Are there a certain amount of levels in "Base" one has to survive?

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Facebook.

All you have to do is reach and unlock all the skins in the Base pack, minus the two unlockables you get when you reah one million points.