Defeat 4 enemies with the same explosion (all explosive items and weapons apply)

Defeat enemies with a stealth attack, melee attack, headshot, and explosives, in that order, in 15 seconds

Just prior to City Chase, stand perfectly still for 30 seconds (stage demo fail)

Play in the ocean near the sunken ship

Use every weapon in the game

Defeat 10 enemies in 60 seconds with the China Lake Grenade Launcher

Drive away in the jeep with Elena without killing any enemies

Climb to the very top of the Clocktower in the City

Defeat 100 enemies in a row without dying in combat

Defeat 5 armored enemies with melee only

Complete Stage 1: Train Wreck

Find the Strange Relics

Defeat 1000 enemies