Complete a chapter of a story with a different tier X tank.

Defeat an opponent in a fistfight without taking any damage.

Collect the formulae for 6 different bomb types.

Install 6 upgrades or modifications in any combination on a single ship

Win a Standard battle and survive while also earning 200,000 credits

Earn 20 ribbons (excluding the 'Target Hit' ribbons) in a single Standard battle

Promote a Commander to rank 11

Research a Tier V ship

Destroy 20 enemy ships in Standard battles

Destroy at least 4 enemy ships in a single Standard battle with an American or British ship

Simultaneously have 5 American or British commanders in your roster

Score 5 citadel hits in a single Standard battle