Question about MP characters unlocked by GoW 1

I got Raam and A. Carmine  but my son not . He completed the 1 act with me and killed Raam but did not unlock the characters. Can someone explain me why ? We played the campaign together from start to end.

 

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Last updated July 3, 2018 Views 1 Applies to:

he got the achievements to right?

he has to have the achievements for killing RAAM on HC like you do to get the unlocks.