Grenades explode even if you throw them directly at an enemy. They will explode on contact. Useful to do this with Bullet Shield Cheat (enter the cheatcode ENCHILADA, then go to Bonus. Choose Bullet Shield, which'll protect you from bullets only, ,and at a certain distance from the enemy, so not too close!! Keyword: BULLETS!!!!!).
Go to the options and select the Enigma machine. Type in: CATFISH. If you did it right, the lights should flash green. Now just check your medal case. If it still isn't full I told you the wrong cheat. My bad!!!