One recent notable achievement by Minecraft@Home was the discovery[0] of the start screen panorama seed which was seen from Beta 1.8 up to 1.12. Reverse engineering Minecraft seeds is an impressive feat given that the search space is so large. The finding of Pewdiepie's survival Minecraft world seed was achieved (without Minecraft@Home) despite him revealing his coordinates via F3 only twice in the entire series[1][2][3].
[0] https://www.reddit.com/r/Minecraft/comments/hthrmk/big_news_...
[1] https://youtube.com/watch?v=LE8ml2hZVZM
[2] https://youtube.com/watch?v=MbAymA6OAa4
[3] https://youtube.com/watch?v=qWnTRNw4mDY