Here is the full list of all 12 Panzer General: Allied Assault achievements worth 200 gamerscore.
Win any game with 3 or more Victory Conditions simultaneously.
Destroy 12 or more units in a single game.
Destroy a unit with 6 or more health in one combat.
Win a total of 50 Multiplayer games on Xbox LIVE.
Win a total of 15 Multiplayer games on Xbox LIVE.
Use 4 or more artillery units in support of a single combat in one game.
Win your first Multiplayer game on Xbox LIVE.
Successfully complete the Campaign Mission One - Utah Beach.
Play 6 or more "Air" cards in one game.
Have a single unit be promoted 3 times by victory during combat in one game.
Successfully complete the first six Campaign missions.
Successfully complete the entire Campaign.