To go back to the OP question, I'm really curious on how much star your submarines finish the campaign with. And if anyone did get 5 stars f or a sub.
I have noticed someone having the achievement on Steam, but he unlocked all 38 achievement the very same day, with such a short playing time, that make it impossible IMO without using hack or extra tool.
I wonder if it is even possible. Subs get so few effective shots compared to other ships and the campaigns are relatively short.
As someone said above, it looks like this achievement was just thrown in the list of 5 stars unit of different type without testing.
After messing with the MP achievements for Panzer Corps, this would be another failure.
It is doable now with last patch, I finally got it. I went with Rising Sun (Japanese subs can fire at 3 range, be sure to buy the sub after getting the Naval Experience specialization; that gives you 2000 exp. I then went for Wolfpack specialization and I assigned a leader with + to naval attack. Also upgraded when I could, but the attack is the same I think. After that the trick is to Milk out the scenarios with ships, I would destroy all DD's and CL's with my main fleet and planes, and the leave the Capital Ships for the sub, it requires baiting and sacrificing some of your fleet. After you get 5000 EXP, you can fire every 3 turns instead of 4. I managed to complete it on the Melbourne scenario with 3 CV's left to shot at and 55 turns togo.
It is very doable now, just a bit gamey.
I am not positive, but firing at point blank range seems to give more XP.
The trick is to involve the enemy destroyers first in surface combat, so they won't hunt for subs. When I approach with my surface ships an enemy fleet, I keep my subs on the flanks with distance, so destroyers won't rumble into them by accident. It just takes a bit patience until you should unleash your tonnage-hungry wolves onto the defenseless capital sheeps in the rear.
As far as I see this on a test-map, torpedo damage is always best on range 1, no matter if any unit (attacker and defender) has moved or not in the same turn. The attack/damage only suffers for naval guns the more hexes any unit has moved in the same turn.
Ya Horst, that is the best strategy, I found that iI would fire with attacks of opportunity at 2 or 3 range , but I always tried to get my sub into position for a 1 hex shot, that gives the most XP.
What players don't see in the game is that units can be damaged by a decimal value too. This way, attacking a seemly invincible defending unit can receive a kill too after many low-damage attacks in a row. This is why a unit can also gain different experience points even if the kill numbers are equal.
I have a sub at 5800 exp and another at 4900 at the end of New Caledonia in the Rising Sun campaign. Will there be enough targets to get to 10000 before the end of the campaign? Most exp seems to come from firing on supply ships from the surface.
What about a level 5 strategic bomber? I have one but it hasn't even a single star despite it's activity. It only does a little damage like 1 hp sometimes cause it is anti-supply mostly so the xp may not be added on purely for the supply suppression effect unlike in Panzer Corps where the strategic bombers go up in xp faster than all other units even if they are not causing much physical damage.
Strat bomber was actually very easy in Rising Sun. Use air specialization to start with 1 star bomber then next get elite air specialization which adds 3 stars. So very quickly you have a 4 star bomber. Bomb units with weak air defense stats and by Java Sea battle it will have 5 stars.
Back on topic to submarine, what is the highest damage you can get vs battleships & cruisers? I have a 3 star sub with a +3 naval attack commander and another sub with +1 attack commander and the most damage I get from point blank range is 2.
Finally got the achievement tonight on New Zealand scenario. At first I was worried this would not be a good mission for submarines but I was very wrong. My subs helped wipe out the enemy fleet at the start and when the IJN fleet pulled out my subs miraculously stayed. I immediately raced south to the allied landing area which arrives on turn 40. I sent bombers to take out the coastal battery and destroyer on the south coast and used ground units to block the landing zones on the beaches. When the allied landing fleet arrives I had torpedo planes take out the two cruisers and my subs went crazy on the transports. They couldn't disembark with my ground units blocking and my sub was able to fire every turn with its deck gun racking up over 3000 XP in about 20 turns getting the fifth star with a torpedo shot on the last landing craft. I am so glad that is over with.
