I've always played this game but I never have managed to unlock the Secret Medal, can someone help me to tell me how? Thank you so much

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UPDATE 6/16/2014 - More crashing issues resolved, gun works a lot smoother
UPDATE 6/17/2014 - Control freezing issues related to the gun should be solved
UPDATE 6/21/2014 - Spider Executioners should be less buggy, fixed some things on sparing Tanas
Perdition is a atmospheric and story-driven 2D Platformer. Set in a metallic wasteland of death and decay, the player takes the role of an android who has "awakened," achieving free thought and self-awareness. Players can explore what remains of the world, choosing whether to obey or disobey the commands of an unforgiving, sadistic god. There are 4 possible endings.
Controls:
"Left/Right" - Movement
"X" - Jump
"C" - Attack (later on)
"P" - Pause
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I've always played this game but I never have managed to unlock the Secret Medal, can someone help me to tell me how? Thank you so much
welcome back detroit: become human
played this as a kid (14/15) i think it gave me a thing for... yknow... well i loved it, and if i played it today i know ill love it again 10/10
This was a very impressive game you bring on sense of ambiance here including athmosphere and the story really bring on some depth to this game and thats what I have been so impressed here, So all in all this was a good game and some deep elements so nice job
~X~
This is my fav games since I was a teenager