Experienced Crewmen
Very rare2.1%Get one of each capital ship class for your faction to level 10 at the same time.
The set of capital ships is different for each of the six factions, but all types are listed in the ship building menu. For this achievement, at least one of each type must be levelled up to 10.
You'll get 
This has to be done in the same game, so resets in each new game. Its not clear yet whether all the ships have to be alive at the same time for this to count - so try to make sure they don't get killed after reaching 10.
The easiest way to keep track of this will be to have a roaming fleet with one or two of each kind, keep them together as a group and use them as the fleet for expanding your empire. You'll then easily be able to keep track of the level of each ship and see which ones to give more action to so they can all reach 10. This can be done with one ship of each kind - but we recommend two, despite the available XP per battle having to be shared, to reduce risk of having to start again if one gets destroyed.