Didn't get apocalypse rewards

[Altrious]

Beat the game with a friend on apocalypse and he got the rewards while I did not. Got rewards for every other difficulty while playing with him but nothing for apocalypse.

[Altrious]

Just in case anyone comes across this in the future. After a comical amount of investigating I found my way to the official Discord where I discovered a comment from a dev that to acquire rewards from a campaign completion requires a "check" of each world boss kill on that difficulty (Yaesha, Losomn, Ne'rud, Labyrinth (cube encounter), and final boss). Not knowing if these checks were character specific or campaign specific I went to kill the Yaesha world boss as my friend did it without me before I joined in his Apocalypse run. I can confirm that it is character specific. After killing the world boss of Yaesha I was able to claim Apocalypse rewards on my character. Hope this helps someone in the future