All my advancements and Statistics got reseted, i realized it when i killed a zombie and i got the "Monster Hunter" advancement.
Also, wasn't there a "Minecraft" tab?
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Have you ever downgraded your world? (opened it in a newer version, then later opened it in a version released before that)
Have you also ever opened the world in Pre-release 1?

no, i never opened it in a older version, i didn't open it in pre-release 1, skipped to 2

If possible, please provide the game logs from the time the achievements and statistics reset.
Please also force a crash by pressing F3 + C
for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.
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i got the crash report, how do i get the logs?

nevermind, got it

Might be in the logs folder but it requires you to find out when exactly it happened. Crash log is sufficient for now.

Please help me, this happened to me too. I had a hefty amount of progress in hardcore, and now the proof of that progress is all gone, Stats and achievements all gone.

It does that on all of my minecraft worlds! I don't know what to do, it just happened today for no reason!

This JUST happened to me. Playing on a (very not new) 1.19 world... short power outage.. Reloaded world when the power came back on and no advancements or stats.
LUCKILY I had JUST backed up a couple hours ago.. But otherwise I would have been really .... irritated.

Did you use another player?
If you use another player in Singleplayer game, it will not keep your Advancements and Statistics,but keep your World and Inventory.

Just had this happen in 1.19.2, game crashed with exit code -2. Reopened game to find advancements and statistics had been reset

Can confirm in 23w18a

Can confirm that this bug still exists in 1.20.2.

Related to MC-183747

Happened to me in 1.20.4.

Hello,
I was with the same dilemma. It happened to me when I updated the launcher.
Well, what you should do, (from my experience) first, check your username well. In my case, I had changed user many months ago. Therefore, the launcher was loading my old user. simple that.
but, is the problem is not that. check this file "usercache.json" located in: "C:\Users\PC\AppData\Roaming\.minecraft", open it, for example using notepad. there you will see the listed users launched in your pc.
[{"name":"jGxxxxxx","uuid":"764ca0a4-9d16-4042-b41d-xxxxxxxxxxxx","expiresOn":"2024-08-03 14:45:22 -0400"},
in this example, "name" is your user. "uuid" is the label to generate and save your achievements.

Still happens in 1.21 sadly, got a BSOD and all my advancements&stats are gone. Can't the game at least keep the corrupted version somewhere for an advanced user to recover needed stats when it fails to load the save? The literal most popular game in the world not doing so is infuriating me as a dev.

Still occurs in 1.21.3, even on servers.