You acquired the PMC

You completed "Rescue Carmona"

Finish the game in Easy Mode

Defeat five enemies in a row with headshots

Defeat 70 enemies with the SAS - 12

Defeat 50 enemies with stealth attacks

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

Complete one Cooperative Multiplayer game

Defeat 30 enemies with the Moss - 12

Defeat 30 enemies with Mk-NDI grenades

Complete the game in Story Mode. (Normal difficulty onwards).

Get flattened by any trap.

Defeat 20 enemies with headshots