Same issue here. I've unlocked the achievements in the game for creating a character with a bun and also with one eye on, but they didn't unlock in the actual achievement list on the console.
Just to test it out too, I did it with 3 different characters, which was also done on 3 different difficulties (Descent, Creative, and Survival).
I also killed Commander Vile with 2 of those characters, and the achievement didn't unlock for that either.
https://i.imgur.com/vcBZ4XN.pngI guess I'll see if they unlock randomly in a couple days
Update (July 22) - I just kept playing on the creative mode, and ending up unlocking 19 of the 20 achievements so far (missing the whelp pet). This morning I logged into the game, and I got a prompt that asked for permission. After accepting, and selecting my character, all 19 achievements unlocked at the same time.