Complete Chapter 3 on any difficulty setting

Kill 30 enemies with the Plasma Cutter

First kill with a Gas Mine.

First kill with Scissors.

Used 20 Health Syringes.

Release Melissa from her Trap.

First kill with a Gun.

Finish the game in Normal Mode

Defeat 20 enemies with the Pistole

Defeat 70 enemies with the M4

Release Jennings from his Trap.

Unlock 5 locked doors.

First kill with a Nail Bat.