As Ne Zha, stun an enemy using Armilary Sash and then ult them.
Armilary Sash is Ne Zha's third ability, which grabs an enemy, stuns them, and pulls you in close. From there, spam your ult button to knock them into the air. While not necessary for the achievement, his ult is a quicktime event; press your basic attack button whenever it prompts you to score a guaranteed crit.
Note that Wind Fire Wheels counts as crowd control, so if someone uses Purification to escape the Armilary Sash stun, you won't be able to ult them.