This will be the second story related achievement, as the achievement title suggests you will be required to eliminate Dr. Steinman. Which isn’t much of a challenge anyway given you will more than likely be playing on the easy difficulty setting anyway. Using anti-personnel rounds helps as well as shooting explosive barrels when he is standing next to them. Setting him on fire with incinerate is handy as this will cause Steinman to run for the water in this arena, which you can then abuse by using electro bolt on him whilst shooting him. Despite those tips you won’t need to get that tactical on easy just shooting him is enough.