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

Cpt. Devin Ross Files -15 points

Grasshopper of Battery – Kill 50 enemies using Melee Attacks.

Lt. Abigail Black Files -10 points

Grasshopper of Ghost – Kill 50 enemies using Ghost Bullet.

Sgt. Frank Delgado Files -10 points

Grasshopper of Pop – Pop 50 heads!

Sgt. Wilhelmina Church Files - 20 points

Complete Al Khali on Hard.

Cpt. Xavier Jones Files - 20 points

Complete Man Down on Hard.

Cpl. Simone Cole Files - 20 points

Complete The Tomb on Hard.

Fr. Paul Rawlings Files - 20 points

Master of Pop - Pop 100 heads!

Agent Muriel Green Files - 25 points

Complete The Path of Souls on Hard.

Arnold Leach Dossier - 20 points

Finish Al Khali - Complete Al Khali on either Easy or Normal.

Deceased Devin Ross Files - 5 points

Complete Still With You on Hard.

Cultist Dossier - 30 points

Master of Battery – Kill 100 enemies using Melee Attacks.

Explosive Cultist Dossier - 10 points

Grasshopper of BOOM – Disintegrate 50 enemies!

Flying Cultist Dossier - 50 points

God of Pop – Pop 250 heads!

The Firstborn Portfolio - 55 points

God of Battery – Kill 250 enemies using Melee Attacks.

Corpses Behemoth Dossier - 20 points

Complete Rivers of Blood on Hard.

OSS British Commandos Files - 50 points

God of BOOM – Disintegrate 250 enemies!

Psychic Commander Dossier - 10 points

Finish World War 2 - Complete World War 2 on either Easy or Normal.

Machinegunner Dossier - 50 points

God of Ghost – Kill 250 enemies using Ghost Bullet.

Flamethrower Dossier - 25 points

Master of BOOM – Disintegrate 100 enemies!

Grenadier Dossier - 25 points

Master of Ghost – Kill 100 enemies using Ghost Bullet.

Sir Richard de Grey Dossier - 20 points

Complete Out of the Frying Pan on Hard.

Brother William of Auxerre Files - 20 points

Complete Motley Crew on Hard.

Warrior Crusader Dossier - 20 points

Complete Sewers on Hard.

Crossbowman Crusader Dossier - 20 points

Complete Tortured Souls on Hard.

Child Crusader Dossier - 30 points

Complete Imperium on Hard without being incapacitated.

Bishop Maltheus Dossier - 15 points

Finish Crusades - Complete Crusades on either Easy or Normal.

Centurion Tertius Longinus Files - 30 points

Complete Decadence on Hard without being incapacitated.

Governor Cassus Vicus Dossier - 20 points

Finish Rome - Complete Rome on either Easy or Normal.

Legionary Dossier - 20 points

Complete The Low Road on Hard.

Blind Behemoth Dossier - 30 points

Complete Morituri te salutant on Hard without being incapacitated.

Gladiator Dossier - 20 points

Complete Temple of Pain on Hard.

Antadurunnu Dossier - 20 points

Complete The God Seal on Hard.

Enlil Sumerian Demon Dossier - 20 points

Complete Spiritual Guide on Hard.

Inanna Sumerian Demon Dossier - 20 points

Complete Skin on Hard.

Ki Sumerian Demon Dossier - 20 points

Complete Flesh on Hard.

Ninlil Sumerian Demon Dossier - 30 points

Complete Skin on Hard without being incapacitated.

Nanna Sumerian Demon Dossier - 20 points

Complete Blood on Hard.

Utu Sumerian Demon Dossier - 30 points

Complete Blood on Hard without being incapacitated.

Sumerian Puppet Dossier - 30 points

Complete Flesh on Hard without being incapacitated.

Pyxis Prima Dossier - 25 points

Finish Sumeria - Complete Sumeria on either Easy or Normal.

The Jericho Team Portfolio - 30 points

Complete Rivers of Blood on Hard without being incapacitated.

Operation: Godseal Files - 20 points

Complete Exorcism on Hard.