Winter Contingency is one of the easiest Campaign Missions to do. You don't have to actualy fight during most of the mission but at the end you are forced to fight... well we'll get into that later. The first thing you do in this mission is have your Falcon land so you can investigate a Destress becon, next you will go into a broken house and find some natives that give you some interesting information, after that you will go into a barn-like structure to find part of the missing trooper squad that you were suposed to find dead as you go on you find there killers a small Coveant strike force sent to retrive information from an ONI database. As the mission goes on you find the rest of the trooper squad holding off a small Covenant attack. After the troopers are evacuated you get in a Falcon and go to the ralay outpost inwhich the ONI database is stored inside you find four Elite Zealots who were the leaders of this pre-invasion. You kill three of these Zealots while there leader got away.
This is a list of all the achievements you can get on this mission
KEEP IT CLEAN
Kill 7 Moa in the second mission
We're Just Getting Started
Complete the 2nd mission on Normal or harder.
They've Always Been Faster
Clear the 2nd mission without setting foot in a drivable vehicle.
Banshees, Fast And Low
Hijack a Banshee during the Reach Campaign.(Although it is less likely, you can EMP/Hyjack a Banshee in this level.)
You can actualy run and hide though most of the mission, thus making it a great mission to do Flawless Cowboys and Chalenges. Paul 11B