Medal of Honor

Very simple, just complete the game on any difficulty, I advise you to play on hard the first time round as its extremely easy and already unlcoked as this difficulty has no big difference between this and the easy difficulty.

The campaign isn't very long and even on hard it can be done in around 3 hours maximum. There are a total of 10 missions spread of 2 days as you play as various characters and constantly switching drastic situations ranging from a desert sniping to a chopper assault..it's a fun campaign.

Campaign Missions as follows:

Mission 1: First In
Mission 2: Breaking Bagram
Mission 3: Running with Wolves...
Mission 4: Dorothy’s a Bitch
Mission 5: Belly of the Beast
Mission 6: Gunfighters
Mission 7: Friends From Afar
Mission 8: Compromised
Mission 9: Neptune’s Net
Mission 10: Rescue the Rescuers

Enjoy.