Kill 10 Enemies with Grenades While Hanging

Defeat 20 Enemies While Swimming

Kill 30 Enemies with the RPG-7

Activate a Tweak

Find all Treasures and the Strange Relic

Defeat 50 Enemies in a Row Without Auto-Reloading

Find 80 Treasures

Kill 75 Enemies in a Row Without Dying

Kill 10 Enemies in a Row, Alternating Hand-to-Hand Combat and Gunfire

Hit 3 Enemies with Fish in the Market

Beat 'Chapter 16 - One Shot at This' in less than 12 minutes

Find 60 Treasures

Kill 30 Enemies with the SAS-12