Edit - March 22, 2018
The requirements for this achievement were changed due to the snapped feature being removed from the XBOX One interface. This solution is no longer relevant due to the new requirements. Happy hunting.
Personally I combined this with the achievement.
I simply voted on 9 solutions and then snapped the app. I viewed the achievements list for the app while it was still snapped (this may require requesting an update on your actual TA site page to register the TA app to your TA games list so that it shows up on your app game list, do this just to make sure). I went to the solution for Opinionated and I voted on it, all while still snapped, thus popping Opinionated and Simul-TA-neous at the same time.