I got confused when it came to this achievement. So just so no one else gets confused obviously this one will come naturally. You will come to credits (where I thought it popped but it didn't) instead it goes back to the beach again (spoiler will spoil next bit)
If you didn't read the spoiler then on the beach you turn Logan's head to the right and then something happens. On the credits with the music track is when the achievement will pop.