Collect all Last Letters, Letters From Home, and Letters To Home in the main game

Reach character rank 25

Shoot all Stone eagles

Incapacitate an enemy, then shoot them in the testicles

Complete all Secondary Objectives in the Main Campaign

Complete the entire main campaign on Cadet difficulty

100 Kills with a Pistol

Kill 100 enemies with suppressed ammo

Complete Mission 6

Kill one of each infantry type

Complete Mission 4

Complete 50% of all Secondary Objectives in the Main Campaign