To easily earn the "Shepherd", "Body Count", "Bronze Damage", "Silver Damage", and "Gold Damage" achievements, do the following. Play Challenge 1 in Single-Player mode. You will start beside two enemy worms, both with 10 health points. Use the Sheep weapon. Press A while facing the two enemy worms and explode (A) when the sheep is between both worms. After they die, press Start then Y to restart the level. Repeat this until you earn the Achievements.