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Professor Mayhem

Purchase 4 different active skills across any number of Resistance Mode characters.

Professor Mayhem0
4 guidesOnline Game ModeSingle PlayerCooperativeLevelShopBuggy +
HateMe4141HateMe41411,661,024
14 Jul 2016
11 2 4
The above solution works but to clarify:

As of right now, this achievement is glitched in your favor. You only need tier 4 in the survivor tree to unlock this achievement.

Can confirm this works as its the only class i used.
Shish Kaa BobbyThis still work just popped it!
Posted by Shish Kaa Bobby on 06 Dec 16 at 00:53
Itzz Sh0wt1m3Good to add. I was doing the brawn and was wondering why it didn't pop for my buddy. Could now use some of the unspent experience on upgrading the survivor.
Posted by Itzz Sh0wt1m3 on 08 Dec 16 at 22:31
hudd2000Worked for me doing this.
Posted by hudd2000 on 17 Feb 17 at 02:26
matdanYep still works, saved me some time thanks is no small thing I can say.
Posted by matdan on 26 Apr 17 at 09:15