Which one fit better in the context of "Complete the next mission"
Hit enemies with bullets 50 times
Hit enemies with projectile 50 times
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All bullets are projectiles, but not all projectiles are bullets. A cannonball, for example, is a projectile, but not a bullet. On that context, it could be confusing. Consider that even a little stone thrown by hand is technically a projectile.
In that context, and without any more information, I'd rather use just "Hit 50 enemies", unless an enemy can be hit more than once before dying.