Hi Greenjack90,
I have the exact same issue as you described and contacted Twitch support for this (still waiting for an answer). I also send Amorelandra an email on the address she mentioned earlier in this thread (also waiting, hopefully on a answer)
I’am also getting a bit frustrated on this and almost thinking about to create a whole new account on twitch and do the Achievements again.
Thanks for listening and have a good day, hope it will be sorted out soon!
Root Duk (twitch: rootduk)