There are countless moves that will launch an enemy into the air, any of which can net you this with ease. This can be done early on with the starting weapons (longsword/bow), described by "yevinorion" - "For juggler, best used with longsword and bow, in the very beginning part. Time two sword attacks with a small pause in between the attacks to launch an enemy in the air, then spam arrows when an enemy is in the air and it should unlock, easy."
This can also be done with a Faeblade Riposte or full dagger combo while the enemy is in the air. Both will net enough hits automatically.