There is no guide for this game yet. But apparently it is EASY POINTS! 

Reporting for Duty - 25 points 

Kill 250 enemies.

More Than Enough - 50 points 

Kill 500 enemies.

Tough Guy - 75 points 

Kill 750 enemies.

Sprint to the Finish - 20 points 

Complete a mission below the target time.

Minuteman Medal - 50 points

Complete all missions below the target time.

Overachiever - 50 points

Complete a mission below the target time and completed all the bonus objectives.

Sniper - 5 points

Killed 75 enemies with head shots.

Close Combat - 20 points 

Kill 25 enemies using melee attacks.

Raining Grenades - 20 points 

Kill 50 enemies using grenades.

Quick Draw - 20 points 

Kill 50 enemies using sidearms.

Cannons Away - 20 points 

Kill 25 enemies using cannons.

Gat-slinger - 20 points 

Kill 50 enemies using Gatling Guns.

Demolitions - 50 points 

Shoot all explosive barrels in every mission.

Marksman - 10 points 

Complete a mission with over 75% accuracy.

Bullseye - 30 points 

Complete a mission with over 95% accurracy.

Pioneer - 10 points 

Earn the rank of Pioneer.

Corporal - 15 points 

Earn the rank of Corporal.

Sergeant - 20 points 

Earn the rank of Sergeant.

Lieutenant - 25 points 

Earn the rank of Lieutenant.

Captain - 30 points 

Earn the rank of Captain.

Major - 35 points 

Earn the rank of Major.

Colonel - 40 points 

Earn the rank of Colonel.

General - 50 points 

Earn the rank of General.

Attention to Detail - 5 points 

Complete one bonus objective.

To the Letter - 40 points 

Complete all bonus objectives.

Chancellorsville - 10  points

Complete the Dawn at Chancellorsville mission.

Cold Harbor - 10 points 

Complete Dr.Gatling`s Secret Weapon mission.

Hampshire - 10 points 

Complete The Gray Ghost mission.

Gettysburg -10 points 

Complete the Sharpshooters at Devil`s Den mission.

Martinsburg - 10 points 

Complete The Great Train Raid of 1861 mission.

Grand Gulf -10 points 

Complete the USS Pittsburg mission.

Jackson - 10 points 

Complete the Infiltration of Jackson mission.

Lynchburg - 10 points 

Complete the Sabotage at Lynchburg mission.

Vicksburg -10 points 

Complete the Captain Blazer`s Scouts mission.

Vicksburg Gate - 10 points 

Complete The Fall of Vicksburg mission.

Ironclad - 10 points 

Complete the Siege of Vicksburg mission.

War Survivor - 20 points 

Complete the game on the easiest difficulty setting (or higher).

War Veteran - 40 points 

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

War Hero - 75 points 

Complete the game on the hardest difficulty setting.

Secret Achievement - 20 points 

Continue playing to unlock this secret achievement.