Make sure you've done each individual chapter - including the prologue. Have you beat the game on Insane yet? If not, you can check by seeing which chapters have the Insane "icon" on them. Check which one doesn't, and complete that one.
Thanks. I am checking/redoing all prologues. I have completed on insane, 4 red stars on all chapters. I'm now gonna keep a log and replay all chapters on all difficulties. Eventually it will unlock. Keeping a log is the only way to be sure! Got alot
of campaigning to do for those precious Onyx medals!
I had a similar problem, did them all on hardcore but my medal only unlocked at casual level, even though when I look at chapter selection it shows all acts at hardcore level. I did however replay a couple of chapters at casual, so not sure if its just taking
the last difficulty of each chapter. Going to replay those chapters on hardcore tonight and see if that works
My onyx medal is not unlocking and its driving me crazy.I beat everything on insane plus 4 player co op but no medal Im a try and play this backwards and if that dont work epic needs to fix this since alot of people encountered this glitch.