This Achievement is called "Taste like chicken" and what you have to do is eat your teammate with corpse eater. in order to do this you want to have Bormin selected and the mutation "Corpse eater" active also to save your game before hand so you can revert once you get it. Now hide Bormin a little ways away from a teammate, select a different character and send him to get shot alot and go in "bleed out" once he is bleeding out select Bormin activate his corpse eater ability eat your teammate you will earn this achievement and the achievement called "My bad" which is for killing you teammate. now reload your save before you did this and continue on with your game hope this helped everyone