Ashina: The Red Witch

In the beginning of the game you have to get a soda for Tena. Walk up to the refrigerator and press A to get a soda. Then walk south to your deck where Tena is smoking, walk directly in front of her and press the RB to bring up your inventory and press A on the soda to give it to her.

You'll begin talking to her, keep clicking through the conversation until the achievement pops.