Unlock the following medals in the "Medal Cabinet" at 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 - Successfully complete all puzzles, including the bonus levels.
Field Marshall - Win over twenty online games.
Laboratory - Successfully complete all laboratory levels, including the bonus levels.
Outstanding Bravery - Make a comeback by winning when you are losing by a lot.
Rookie - Successfully complete all training levels.
Tough Nut - Successfully complete all campaign levels, including the bonus levels.
Veteran - Play twenty online games
Winning Streak - Win five games in a row.