2 darksiders achievement not working

I’ve been playing dark siders and I finished the entire campaign on medium and there’s two achievements that I’m not getting in that one for defeating the destroyer and one for completing the campaign on medium and I’ve watched the entire credits in movies
after the boss fight to see if that would activate The achievements and after I’ve beat the campaign I’ve still played and got other achievements through collecting other stuff through the game and I’ve tried to go back to where I started the boss fight to
maybe try again but since I’ve already paid the boss it won’t let me play the boss again and I don’t want to spend another 10 hours to play for the campaign to get to that to try to get the achievement if you could help solve my problem that would be great
thanks

:)

 

Forum Regs. Leaderboard. Non-Tacky (CTP) For Kids

Got my last couple of achievements on Darksiders 2.Easily my goty so far.

 

gamerscore reset.

never modded in my life, last achievements i earned before the reset was the achievement for beating darksiders 2 on the hardest difficulty which also unlocked the 2 before it.