How I Found Out
If you were just like me trying to 100% MPN and following guides, this one is the least explained (because its very easy but so dumb to find out on how to do it, i just found out now and i feel stupid).
The way I found it was through a russian guide and, so heres an english guide.
The Achievement
You have to be on The Rush (the last level), do it on any difficulty you wish, just do everything to get to kill Gestalt until you have to explode his head with C4.
When you explode Gestalts head, two of his tusks will fly off and you can pick one up. Pick a tusk up and start bashing him till he is dead, do NOT throw it though, last time I did that the achievement didn't pop up. I suggest commanding your teammates to go away as they might mess up getting the achievement (im not quite sure though so dont count on that).
Once Gestalt is dead by your last tusk punch, you should get the achievement.
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=3033003919
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