I had a seasonal character in Diablo 4 S6 on PS5 and I reached paragon lvl 299 a day before the S7 season started (all my other eternal characters were lower lvl than 299) and I was planning to play this character as an eternal one until I reach the lvl 300. To my surprise, once the season 7 started and my character moved to the eternal character list, he was lvl 300 as well as all the other characters (some were on regular lvl 50, some on lvl 60, but all paragon lvl 300). Unfortunately, at the same time, my âreach lvl 300 with any characterâ trophy did not unlock, nor did the corresponding mount. What do I need to do to unlock the trophy (the last one I need for my 100% completion)?
I have the exact same issue with the Xbox version . Searched through the internet but I couldnât find a solution
Itâs EXACTLY my Situation. So frustrating! Was 299, then Season 7 startet and my Character was 300, but no Achievement! Hope it will be fixed!
Were you able to resolve the issue? Did it not work on PS4, on PS5 or on both trophy sets? I would like to avoid this situation once season 7 ends. Best of luck to you!
I read the new patch info and this has been resolved.
@zoranristic, @OpalWisp, @HowlinMaikel, did this resolve your problem? Would be great if you could give a short updateâŚ
The Patch 2.1.1 didnt solve the Problem. Achievement wont pop. Pushed an old eternal character from 50 to 60 (300) but this doesnt help. I try now a new Charakter and Level from 1to 60âŚ
@HowlinMaikel Oh dear. Thank you very much for the update and good luck! Please keep us posted.
Nope, still no trophy 
@zoranristic Thank you very much for the feedback and best of luck! Looking forward to a solutionâŚ
Also seeing this after getting to 300 last night. I played Spiritborn in seasonal on Xbox right up to 289. It went to 290 in Eternal. I played a little more with Spiritborn but wasnât getting the same efficiency in my pit runs, so swapped to my Barb which I made when the game first released (always been in eternal).
I opted for a leap earthquake build which was tricky for me to work with on controller so I then decided to play on PC instead. I took this build all the way to 300 last night but no âdevout championâ achievement. Challenge is showing in my collections as completed and I seem to have the mount and trophy rewards.
I then tried ranking up my Necro (also solely eternal) from 29 to 60 last night on PC and still nothing.
The only thing I havenât attempted is either to try a new character from scratch in eternal or to rank up another eternal character on the Xbox. Though I feel this would be a wasted effort given the other reports in this thread.
I have a feeling that starting a new seasonal character and getting it to 300 would likely work, but I am not prepared to risk devoting that much time to it again.
Any suggestions or updates would be greatly appreciated.
Thanks
The Only possibility to be confirmed is a new Season character pushing to P300. Maybe somebody will Report if it worksâŚ
That would be incredibly frustrating for anyone not able to achieve paragon 300 before a season ends. As such, I am seriously hoping this gets a fix which adheres to the current description of âreach Paragon 300 with ANY characterâ.
Happy to be contacted to trial run any potential fixes if required.
@J4G036-2138 Did you hit 300 while playing on PC or while playing on console? This might make the difference.
I asked a Player who achieved the trophy yesterday! He was completely playing a new season character and it worksâŚmaybe i will risk itâŚ
I got to 291 last season and have been playing as a different character in eternal. This character never played any seasons but the paragon points from last season transferred to this eternal character. Itâs at 296 now, should I go ahead and get to 300 and see if the achievement unlocks or should I wait to see if they patch this? Does anyone know if they plan on trying to fix this again?
@TheLobo Thatâs difficult to decide.
They fixed one bug on eternal (unable to achieve the trophy if you were level 100 before season of hatred), but we have no positive report that it really works on eternal in all conditions now. We donât know why @J4G036-2138 didnât get the achievement, but it could be because she/he was playing on PC instead of console; it could have worked when playing on console. We know it works if fully boosting Paragon 300 in seasonal.
I will try to do it after the end of the current season. I want to reach just 299 on eternal after the season ends and then do the last level on eternal. But I donât know for sure that it will work.
If you go for it and it works, please tell us. 
I havenât played this season yet, been focusing on getting to level 300 with my eternal character that transferred from last season. Other achievement hunters on the website true achievements, have said they were above level 100 in season of hatred and didnât get to 300 in time for seasons end. They then leveled up to 300 in eternal and no achievement and are saying they didnât fix it. Since I am in the same situation as them, I doubt it unlocks and I am concerned the bug wonât be fixed retroactively.
It appears the only way to unlock it is by doing it in one season, or strictly playing eternal without ever playing seasonal. I think I will wait at 299 and see if they patch it because I donât know if I can level up another character again from scratch.
I did hit 300 on PC when I switched to my Barb yes.
I have just tried getting a brand new eternal character from 1 to 60 solely on Xbox and still no achievement.
The game knows I have done it as I have the âSupreme Paragonâ Challenge completed. Just not the associated Xbox achievement.
Thank you for the information, is there another place to report a bug like this, I feel like Blizzard isnât even aware of this issue after their patch to supposedly fix this.