Worms 2: Armageddon

This will unlock on your first playthrough after completing Mission 1 - all you need to do here is defeat every enemy worm. You shouldn't have any problems here, as the enemy team has significantly lower health than you, not to mention the fact that they are extremely inaccurate. You also have a decent selection of weapons to choose from, including Homing Missiles, Airstrikes, and the Super Sheep.