Resident Evil Revelations 2

This can be unlocked as early as Claire's first episode in the game when you get the crowbar, I shine the light on my enemy to stun him and then melee'd him with the crowbar, then switched back to Claire and hit RT to do the follow up attack and got the achievement!

Note: it may take a few hit with the crowbar to stun then, but once you do quickly switch to Claire for the follow up attack and a nice 60 gamerscore!


edit: apparently you don't have to switch back to Claire to get this achievement, as the A.I. will do the follow up attack for you and get the achievement. Credit to Epic Louie with this discovery!

During the first mission you will come to a point where it teaches you how to switch characters. Once you get the keys, change back to Moira and head towards the door. An enemy will burst out and just keep your light on him until Claire kicks him.

Early on in Claire's Story you will get the ability to switch to Moira (Y/Triangle). Stun a zombie with her flashlight and Claire will attack it automatically.

In the room where you shoot down the keys you will be attacked by a zombie which you can use to get this right away, but it can be done throughout the whole game.

This works the same in Co-op.