Here is the full list of all 38 Order of Battle: World War II achievements.
Destroy 5 aircraft with a single unit in a campaign game.
Using the scenario editor, launch a custom scenario with as least 2 units for each player.
Complete the tutorial campaign.
Accumulate a reserve of 1000 Resource Points in a campaign game.
Destroy 5 ships with a single unit in a campaign game.
Capture a Victory Point with an advance move.
Complete the Japanese campaign.
Complete the US campaign.
Complete the tutorial campaign without losing any unit. Difficulty level III or higher.
Accumulate 3 Yamato class battleships during a campaign game, each with at least 2 kills. Difficulty level III or higher.
Accumulate 8 tank class units during a campaign game, each with at least 2 kills. Difficulty level III or higher.
Accumulate 5 US Marines during a campaign game, each with at least 2 kills. Difficulty level III or higher.
Destroy 5 tanks with a single unit in a campaign game.
Destroy 10 tanks with a single unit in a campaign game.
Destroy 15 tanks with a single unit in a campaign game.
Destroy 5 infantry units with a single unit in a campaign game.
Destroy 10 infantry units with a single unit in a campaign game.
Destroy 15 infantry units with a single unit in a campaign game.
Destroy 10 aircraft with a single unit in a campaign game.
Destroy 15 aircraft with a single unit in a campaign game.
Destroy 10 ships with a single unit in a campaign game.
Destroy 15 ships with a single unit in a campaign game.
Gain 5 experience stars on an Infantry class unit during a campaign game
Gain 5 experience stars on a Reconaissance class unit during a campaign game
Gain 5 experience stars on a Tank class unit during a campaign game
Gain 5 experience stars on an Anit-Tank class unit during a campaign game
Gain 5 experience stars on an Artillery class unit during a campaign game
Gain 5 experience stars on an Anti-Air class unit during a campaign game
Gain 5 experience stars on a Fighter class unit during a campaign game
Gain 5 experience stars on a Tactical Bomber class unit during a campaign game
Gain 5 experience stars on a Strategic Bomber class unit during a campaign game
Gain 5 experience stars on a Destroyer class unit during a campaign game
Gain 5 experience stars on a Cruiser class unit during a campaign game
Gain 5 experience stars on a Battleship class unit during a campaign game
Gain 5 experience stars on a Submarine class unit during a campaign game
Reform a single naval unit 5 times during a campaign game.
Use the Banzai Charge ability to destroy an enemy unit, dealing at least 5 points of damage.
Accumulate over 100 points of damage taken on a single land unit during a campaign game.