Sabotage the Soviet space program.

Escape Vorkuta.

Ensure your squad escapes safely from Cuba.

Break free from the torture chair.

Complete "The Assault on Fort Mercer".

Complete DNA Sequence 9.

You completed the mission "I'll Take Her".

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.

Beat the game

Solve the Three Judges

Acquire the Boreas Icestorm

Kill Cronos