Here is the full list of all 13 Reloader: test_subject achievements.
Finish game without fixing slide back.
Defeat inhanced enemy with two shots to the body and one to the head.
Finish game with keeping concentrate over 50%.
Finish game with Bullet counter mode.
Finish game with Reloader mode.
Escape from the Building without breaking a lightbulb
Escape from the Building.
Execute close combat with injured enemy.
Use tactical targeting.
Defeat enemy with two shots to the body.
Switch new magazine when bullet in chamber.
Defeat three enemies with head shot in a row.
Learn how to reload.