Name the locomotive.

Kill 50 Enemies with the M4

Kill 30 Enemies with Mk-NDI Grenades

Patch the Gasmask.

Kill 75 Enemies in a Row Without Dying

Kill 50 Enemies by Melee-Attacking from Behind

Defeat 20 Enemies with Hand-to-Hand Combat

Finish the Game on Normal Without Changing the Difficulty

Kill 30 Enemies with the Mk-NDI

Find 20 Treasures

Kill 30 Enemies with the SAS-12

Successfully Counter all of a Brute's Damage-Giving Attacks

Kill 30 Enemies with the G-MAL