Kill 30 Enemies with the Dragon Sniper

Beat 'Chapter 12 - Heading Upriver' in less than 5 minutes

Defeat 250 Enemies with Headshots

Kill 50 Enemies with the Micro-9mm

Find the Strange Relic

Kill 50 Enemies with the Moss - 12

Activate a Tweak

Finish the Game on Normal Without Changing the Difficulty

Kill 50 Enemies with the M4

Kill 30 Enemies with the MP40

Explore Photo Mode

Find 10 Treasures

Kill 100 Enemies with Headshots