To get the trophy that's called "High-Flying Hurler", you must kil a flying enemy with a thrown Tediore weapon.
You can get this at the beginning of the game. Run down the hill and exit Liar's Berg, then look up in the sky. You will see Rakks flying around high in the sky. If you have a Tediore weapon in your inventory, equip it.
Shoot at one of the Rakks for a bit and make sure it has very little health. As the Rakk swoops down on you, quickly throw the Tediore weapon by pressing
. The Rakk should die form the exploded weapon and the trophy should unlock for you.
Another way of getting it is through Maya's Phaselock skill. You can weaken the bird a bit, Phaselock the enemy, then throw the Tediore weapon at it for the kill.
Have fun and good luck!