Thanks to... distractions, I've completed two major challenges. 

It feels good. 

I guess I can go back to my favourite characters now... although recently my usual non-challenge character go-to is Turian Havoc (or Turian Ghost, depending on my mood) because I can do melee attack like Saitama XD... which is to kill the lower level enemies in one punch lol. I even change their appearance to Saitama's colours - yellow and red - instead of my usual blue and red theme. (Though I can't add red yet for my Turian Ghost because I haven't unlocked the secondary colour option)

Oh, I also need to focus on weapon challenges now... it has been fun learning to use other ones. I've unlocked some rare ones recently so I can't wait to try them more. Wasn't really a fan of shotguns before but after finding some good ones (and learning to use them in the game - it doesn't really scare me to get closer to the enemies anymore, though I still run from banshees :P), I think I can like them now. 

I can also do more silver matches, I guess. I need the credits and practice.