Kill a zombie using an environmental hazard in any game mode

Defeat 50 enemies with the Dragon Sniper

Defeat 50 enemies with stealth attacks

Defeat 20 enemies by shooting from the hip (without aiming with L1)

Find 30 treasures

Defeat 20 enemies with gunfire by aiming while hanging

Defeat 70 enemies with the FAL

Defeat 50 enemies with hand-to-hand combat

Defeat 30 enemies with Mk-NDI grenades

Find the Strange Relic

Defeat 20 enemies with headshots

Find one treasure

Obtain a medal for every cell in Meltdown.