Soul Survivor achievement

[Unalive3]

I let me fiance play this game and she amassed all of the achievements within a couple hours except for the Soul Survivor one. She used a vial on Stage 3. So can I go back through stage 3 and get the achievement or will I have to play the game all the way through again?

[Baihu1983]

Have to start over

[Unalive3]

Have to start over

damn. At least it was a short game. Thanks!