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