Defeat 20 enemies with a single punch, after softening them up with gunfire

Defeat 75 enemies in a row without dying

Find the Strange Relic

Finish the game in Crushing Mode

Find 90 treasures

Defeat 70 enemies with the FAL

Finish the game in Easy Mode

Finish the game in Hard Mode

Defeat 250 enemies with headshots

Defeat 50 enemies with stealth attacks

Defeat 30 enemies with the Desert - 5

Find 60 treasures

Defeat 30 enemies with the RPG - 7