"Get credit for killing" is a objective in the sidequest MMORPGFPS in Tiny Tina's Assault on Dragon Keep DLC.
Walkthrough
In the Fields of the Fallen you will find 3 NPC's spawn camping. Join them in waiting and a Skeleton Warrior will appear. It does not matter who delivers the killing blow this round as the party will get the credit for the killing. This is automatically filled for the first kill of the skeleton that appears.
