how to Earn the Single Player Achievements in Call of Duty 3

Introduction
There are quite a few Achievements you can earn in Call of Duty 3, some of which are quite simple, others extremely difficult and one “secret” Achievement that you can only read about after its been unlocked! If you’re the type who likes to play a game for the Achievements, here’s what you need to do to unlock the single player ones.
Instructions
Difficulty: Challenging
Steps
1Step OneComplete the game on any difficulty level. This will net you 6 Achievements.
2Step TwoComplete the game on Veteran difficulty. This is REALLY hard, but will net you the Grizzled Veteran Achievement.
3Step ThreeAvoid getting hit with bullets 30 times. If you see gunshots rattling off the cover you just got behind, you’re on your way to getting this. If you complete the game on Easy, you’ll probably pick this up somewhere along the line.
4Step FourFinish a mission using only assault rifles, melee attacks and grenades. The easiest place to do this is The Corridor of Death. Nearly every enemy trooper is carrying the Stg. 44. This is an assault rifle and will provide you with effectively unlimited ammunition.
5Step FiveComplete a mission by firing only German weapons. This is really easy. Do this on Night Drop. Take the Kar-98 off the first guy you whack in the head with your Sten, then just use that the whole way through. This will also get you an Achievement for using only bolt-action weapons! Just make sure you don’t fire a single shot with the Sten, and you’ll be ok!
6Step SixFind a big jump and catch some air with a jeep. This can also be done in Night Drop, once you get Vera back. There are two places to do this while driving; first is the hay field you drive through (with the large rolls of hay.) There’s a ramp leading off the wall at the far end. Use that. The other option is to drive down the middle of the train tracks near the very end (the train yard right before you go down a small slope and over the rickety bridge.) The jump is in the center of the train tracks.
7Step SevenLive through a mission without firing a single round. Night Drop is also a good place to do this since there aren’t a lot of long-range battles to be fought. Grab the Kar-98 to melee, it hits harder than your Sten. Note that you CAN use grenades and still get this Achievement. Just make sure you’re on Easy difficulty. Completing this Achievement may also net you another Achievement for using less than 300 bullets in a level.
8Step EightPick up and return 5 live grenades. This is just fun!
9Step NineComplete a mission without dying or using checkpoints. This is harder than it seems, even on Easy. Best mission for this is St. Lo.
10Step TenUnlock the “secret” Achievement, the Purple Heart, by persevering despite grievous injuries. Basically, you have to die A LOT and keep on going, trying to finish the level. This is a shoe-in if you’re playing on Veteran difficulty because its practically guaranteed that you WILL die a lot!