So I FINALLY got Classic Outfit 1. The S.T.A.R.S. or STARS outfit. The requirement I
think is 100 kills in Mission 1. I got 89 kills and 79% accuracy, no deaths in one run - no outfit. Then I did it again, died once to the big guy upstairs, but got over 80% accuracy and
134 kills.
The hardest part for me was just killing zombies in the Forest area. The game would keep on crashing unfortunately.
You do not have to do this in one life. Time doesn't seem to be an issue either as you can see.
I hope this information helps some people in unlocking the outfit. You can also get different hairstyles by beating all of the enemies in the sewer, and then going on to kill a considerable amount in the forest. I got a notification during gameplay when I killed a certain amount of zombies in the area.
Also if anyone wants a save file for the outfit I have it attached. Version 2.105
This is the data for the game found in AppData/Local/Bioasshard. Enjoy! If it doesn't work let me know