Mission select:To unlock Mission select, complete the game. Note: Using mission select will prevent some achievements from being earned.Full health glitch:Note: This trick may no longer work after the latest game update. Pause the game on Xbox Live while low on health. Rotate the D-pad in a full circle at least three times. Select the “Achievements” option at the menu. Press B to exit that screen. Select the “Resume Game” option. You will remain at the same screen. Select “Resume Game” again and your character will have full health.Alternately, pause the game on Xbox Live while low on health. Press the Xbox Logo to enter the Dashboard menu. Press Xbox Logo again to exit the menu, then resume the game. Achievements:ACHIEVEMENT – HOW TO UNLOCKArmored Attack (6 points) – Get in the tank with two other players.One Man Army (7 points) – Kill 200 enemies.Veteran (7 points) – Beat the game on Black Ops difficulty.Mercenary (15 points) – Beat the game on Suicide Mission difficulty.Humanitarian (10 points) – Rescue all of the POWs.Sleuth (20 points) – Find all Secret Areas.Brasso (10 points) – Achieve the 12X score multiplier.Hero (10 points) – Achieve the 24X score multiplier.Freedom (25 points) – Free 25 POWs.Madman (30 points) – Attain a 24X score multiplier on every level.Combined Assault (40 points) – Beat the game with at least one other player.Reckless Driver (20 points) – Kill 40 enemies while in a vehicle.