Rescue the Leif from a Narbear and three swamp serpents before he gets hurt. There are two parts to this achievement. First kill the four monsters before they can hit Leif. The Narbear will most likely attack Capell and Aya while the snakes will go straight for Leif. Second, after killing all four monsters, a Garuda will grab Leif. Immediately connect with Aya and have her shoot the Garuda, which will cause him to drop Leif.