Won your first non-private match.

Scored your first kill in a non-private match.

Get hand picked for Shepherd's elite squad.

Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.

Defeat 20 enemies with gunfire by aiming while hanging

Defeat 75 enemies in a row without dying

Defeat 30 enemies with Mk-NDI grenades

Defeat five enemies in a row with headshots

Defeat 70 enemies with the M4

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

Find ten treasures

Defeat 50 enemies with hand-to-hand combat

Find one treasure