- It was in the launcher.
- It was on the official website.
- It was posted on the forums. Return to the Icy Realm of Northrend in World of Warcraft®: Wrath of the Lich King Classic™
- It was posted on Wowhead.
- It was on MMO-Champion.
- It was on Icy Veins.
These were all posted around 2PM PST on 2022-04-19T07:00:00Z. I have no idea where it is that you get your information, but this knowledge was published and plain to see. There wasn’t a single site that I checked where it didn’t mention achievements.
You missed the information. There’s nothing wrong with that! But there’s overwhelming proof that this news was plastered all over the internet for the world to see. Take the L, dude.