Just looked at the achievement list photo again and it's still very speculative but what if Reiko died and Quan Chi / Havik tries to put his soul into the body of flesh and blood that is being held in the library stage? We know Reiko always wanted to takeover from Shao Kahn and be like him. Maybe that is the way for Reiko to become the blood god? Quan Chi can control the dead so it's a bit odd for him to create a whole new body, but NRS knowing, they could find a way to make it work.
Why Quan Chi would help him, I reckon because he wants to defeat Shinnok so he himself can rule but needs a much stronger force than himself. He doesn't want to become blood god himself since he's a control freak. Therefore, he creates the body.
Why Havik would help him, well it's fairly obvious from the comics that he wants to create chaos..
It could also just be Reiko by himself or working with Quan Chi, but since Reiko probably wants to become the blood god himself according to the comics, that is unlikely. Havik tells him he can become one and Reiko will subsequently not need Havik. The fact that he will not need Havik could mean an easy death for him after Reiko finds out how he can do it. It is said Havik reveals his plans to Cassie so anything can happen.
The third and maybe most likely thing to happen is that Quan Chi catches wind of all this and wants to release Shinnok. Since Shinnok is technically a spirit inside the amulet, he would need a body to 'live' and for his spirit to enter and become the blood god? I just cannot imagine that Havik and Reiko are not tied to all this, but with this last explanation, it would be easy that Quan Chi finds out from Cassie after either / both have died or he confronts Havik / Reiko himself after which he kills either or both.