Genshin Impact - Dalet

The first time I couldn't figure out how to properly charge attack. In part due to lag, in part due to me thinking, at the start, that the elemental attack was the "charged" attack. Furthermore, my play style with claymore users made it so that I wasn't sure about how to perform the charged attack outside of "E". Do to the difference in play style I have in Keqing, I was able to figure out the charged attack thing.
I had actually tried during the first failure to see if there was an achievement where you somehow kill the Hypostatis without breaking the shield by slowly whittling its HP down, however it didn't seem like that was possible.