Nerves Of Steel

Achieve 100% accuracy in any single player mission

I Never Bleed

Complete the Campaign using max one medkit per mission

Left No Man Behind

Complete the game on Casual

My Rifle Is My Best Friend

Complete the game on Medium

Nemesis

Kill Maddox once and for all ("No Loose Ends")

Psst, Don't Look Behind You

Kill 15 enemies with a stealth kill

Operation Archangel

Complete Act 2

Say Hello To My Little Friend

Kill 30 enemies using your sidearm

Hangman's Knot

Kill Major Vladic ("And Justice For All")

Bullets Can't Hurt Me

Complete any act without using medkits

Operation Quarterback

Complete Act 1

Death's Scythe

Take 50 headshots in single player

Solid Sandman

Kill all enemies in the beach houses without causing an alarm ("Leave No Man Behind")

Hazardous Materials

Kill three or more enemies by shooting a grenade

Fisher King

Kill 25 enemies using thermal or night vision goggles

Guardian Angel

Rescue the friendly ("From Out Of Nowhere")

Distance Matters Not

Kill 20 enemies from a distance of 600m or greater

Kill With Still

Kill 50 enemies while holding your breath

Worlds Apart

Take a successful shot from a distance of 1 km or greater

Balls Of Steel

Complete any single player mission without using med kits, but taking damage