For his achievement, he used the character Kay.
In Genshin Impact, after the release of update 2.5, the barriers of the Inazuma Islands disappeared. A Twitter user under the nickname GNnoMUGI decided to check whether it is possible to get to this location not on a story ship, but independently. He used the character Kay, who knows how to create small ice islands and headed towards the islands.
It turned out that now you can get to the new location without passing the main story quest. Previously, this was not possible due to barriers – players who made such a path were teleported to the starting point.