Good news is that for whatever reason the tentacles of the reaper don't count as fighting
So I suggest downloading Reaper Creeper Cheeser campaign by Landfall in the workshop
Then go to custom content, press
to get to campaigns then tap
and play the campaign, sadly it's only 4 levels so you'll have to repeat it 7 time
And boom you'll get Reaper Creeper, Catch me if you can and Lone Ranger