Gain the loyalty of the mercenary ("Cerberus Pack" downloadable content)

Gain the loyalty of the biotic Convict

Failed to prevent the attack

Win from a draw or behind while down a man in a game vs the CPU

Defeat 20 enemies with headshots

Find one treasure

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

Kill 50 enemies in a row without dying

Kill 50 enemies with the 92FS - 9mm

Visit 100% of the planets in an unexplored cluster

Perform 30 headshot kills with any weapon on humanoid targets

Obtain 10 technology upgrades

Complete any research project in the Normandy's laboratory