Didn't get achievements for beating the game

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So I finally beat the game on death march after 4 years of playing it on and off taking me time playing the game went through it on the hardest settings for the achievements and for the challenge as the others felt far too easy I got my ending and watched the cutscene and didn't get anything didn't even recognize I beat the game despite the game telling me to try new game+ any ideas whats going on please tell me I don't have to play the game again??? it's disheartened me so much after what is my game of the decade???
 
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