Dark Falz 2 Achievement?

[wgpfly]

From what I have heard you can get this achievement with this event. My only question is then what mission from the event would I have to do to earn it?

[BIG OLAF]

Kill Dark Falz at the end of Zeta.

[wgpfly]

Thanks for the quick response.

[_Snoopy_]

be sure to do it on S2 or S3

[BIG OLAF]

be sure to do it on S2 or S3

Don't need to. Dark Falz is in his 2nd form no matter what the difficulty.