Win the battle using only 50 shells.
Destroy two ships in a row
Win the battle with at least 3 ships left
Win the battle with your aircraft carrier still afloat.
Win battle saving all three destroyers.
Win the battle with both of your Cruisers afloat.
5 times achieve 15,000 scores.
Win 10 battles.
Win 15 battles.
Win 15 battles
Win battle in less than 80 seconds.
Destroy three ships in a row.
Win the battle using only 40 shells.
Win the battle with at least 4 ships left