Reach one of the game endings

Recruit Mikhail

Recruit Olga

Recruit Sashko

Recruit Tarakan

Find Oliver and convince him to help you

Finish "An old friend" quest

Finish "On opposite sides of the barricade" quest

Finish " Kozlov Killing" or " Kozlov Kidnaping" quest

Finish "Power plant" quest

Change your memory for the first time

Finish "Old Documents" quest

Modify any weapon

Gain access to the second tier of structures in the base

Gain access to the third tier of base structures

Complete "Conspiracy" Board Investigation

Complete "Web of Lies" Board Investigation

Complete "Black Stalker" Board Investigation

Complete "Woman in Red Dress" Board Investigation

Finish "Traitor" quest

Finish "Weapon transport" quest

Finish "Chain Reaction" quest

Finish "Some excuses" quest

Finish "The truth about NAR's experiments" quest

Finish "Hacking into NAR servers" quest

Finish "Hermit" quest

Finish "Big Fish" quest

Finish "A memento from the past" quest

Finish "Meeting with Tarakan" quest

Finish "Hardware for real men" quest

Finish "Checkpoint assault" quest

Finish "A few things from an old hideout" quest

Finish "Hard truth" quest

Finish "Black Stalker" quest