CW: Secret Missions achievements

Completed all missions below the target time.

Killed 50 enemies using Gatling Guns.

Completed the game on the medium difficulty setting (or higher).

Completed the Siege of Vicksburg mission.

Earned the rank of Major.

Killed 500 enemies.

Killed 25 enemies using cannons.

Completed one bonus objective.

Completed a mission on land without running.

Completed Dr.Gatling`s Secret Weapon mission.

Killed 250 enemies.

Completed The Gray Ghost mission.