Use the following trick to get the "Shepard", "Body Count" "Bronze Damage", "Silver Damage" and "Gold Damage" achievements. In Single Player mode, go into Challenge 1. Your first turn will start with your worm beside two enemy worms, both with 10 health points. The best way to rack up achievements is to use the Sheep weapon. Press A facing the two enemy worms and explode (A) when the sheep is between both worms. This will easily kill them because they have 10 HP each. After they die or drown press Start then Y to restart the level. Do this repeatedly until the achievements appear. Damage and kills are irrespective of level progress as you will notice after getting a few achievements by doing this.