CheatCodes.com has the complete list of all Call of Duty: Classic Achievements and Gamerscores for X360, including all secret Achievements. All official X360 achievements for Call of Duty: Classic as of Thursday September 3, 2015 are shown below, or you can print out our Printable Achievements Checklist that shows all Call of Duty: Classic Achievements and Gamerscores in a simple quick-reference format.
Complete the American missions.
Complete the British missions.
Complete the Russian missions.
Complete the game on the hardest difficulty.
Get kills using a pistol, rifle, submachine gun, and grenade in a mission without dying.
Complete a mission using only a pistol and no melee attacks.
Complete a mission without dying or loading a checkpoint.
Complete the game.