Achievments and ideas

I currently play halo wars 2 on Xbox one.
I would like to see more playilist voting when playing against the AI in 3vs3 I.e (stongholds,deathmatch or control). I also am experiencing achievements not unlocking for sgt johnson requires mech stomp to kill infantry it is not counting my progress stuck on 4%. Also look at the time allotted for the condor strike vs scarab in blitz matchmaking the condor not only has more health it also stays out a lot long then the scarab.