Unlock the following medals in the "Medal Cabinet" under the options screen by performing the corresponding tasks:
MEDAL - HOW TO UNLOCK 100% Complete - Get a 100% game completion. Annihilation - Win with a lot of health. Beserker - Kill eight or more worms in one round. Big Spender - Buy every item in the shop. Boffin - Beat all puzzles, including the bonus levels. Field Marshall - Win over twenty online games. Laboratory - Beat all laboratory levels, including the bonus levels. Outstanding Bravery - Make a comeback by winning when you are losing by a lot. Rookie - Beat all training levels. Tough Nut - Beat all campaign levels, including the bonus levels. Veteran - Play twenty online games Winning Streak - Win five games in a row.