I can't unlock different accessories by completing trophies on my PS4. I then connected my Microsoft account on Minecraft Windows 10 Edition on my PC and did the achievements on there and it worked. Therefore, it was unlocked on console. Additionally, I realized that the Windows 10 Edition didn't count for the achievements I had earned on my PS4.
Thank you for your report!
We're actually already tracking this issue at MCPE-87307, so I will resolve and link this ticket as a duplicate.
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