How do you get an S rank in a mission. Do you have to complete all subquests? It seems rather impossible to do so, like in 00 mission, the subquests require you to beat in in 5 minutes, take less than 10000 damage, do charge attack 10 times kill more things 10 times, and defeat mini bosses one in under 2 min and another in under 30 secs. Then it requries you to back track and find all the parts, and destroy everything. Its IMPOSSIBLE to do all that in under 5 mins. Is that really how you get an S rank?