Welcome to Battleship, this is very... very easy to complete and you'll spend more time grinding matches than you will anything else. It should only take an hour or so to complete but you will need 2 controllers to do it in that timeframe.
First of all head on over to custom game, make sure you're on 1 round victories, and start up a game of Salvo. When the game starts place all of your units inside 2 lines, I always placed mine on the bottom row horizontally but feel free to mix it up if you want. When the game prompts Player 2 to place his units do exactly the same but make sure to place the Destroyer (the small 2 unit ship) first in its row and put the 3 unit ship next to it. If you have it set up as I did, the bottom row will have one free grid space and the row about it will have two.
I'll list all the achievements you'll unlock in this game at the end of the game.
In Salvo mode you're able fire off as many shots as you have ships in your fleet, you have 5 units and so... 5 shots. For the first round target the line you placed the Destroyer in and (assuming you placed the units left to right) fire in a line so that you destroy it and the next ship. Provided that went off without a hitch that's 3 achievements unlocked right there!
Throughout the game always make your second controller misses. Just fire as far away from your ships as possible.
On your next 3 turns fire in rows of 5 so that by the end of your 4th turn you've destroyed all the enemy ships and won the game. The board should look like the bottom 20 grid squares have all been hit (provided you placed them in the bottom of the grid, obviously if you placed the ships at the top of the board, the top 20 grid squares should all be marked off). That's the first game done... and most of the achievements unlocked too!
Sink your opponent's Destroyer before any other ship
Win one game of Battleship against a friend
1 guide Escort Mission
Finish a game with two ships still afloat that are next to each other
Win at Battleship while keeping at least 3 of your fleet afloat
Now opt to play again. Do exactly the same as you did last game but instead of you winning make it so that Player 2 is winning and your shots are missing. At some point during the game you'll see that you made a hit, but know that it's not true because you know there are no ships there, its just a decoy. On your next turn fire well away from that area (its area of effect is only one adjacent square, but be safe and fire as far as possible). Once you've done that you'll unlock the next achievement;
Once you've unlocked the above achievement the best thing to do is restart the match. Restarting is quicker than trying to win with a crippled fleet.
There's not much to this next achievement, just keep starting up Salvo games and winning them. It goes by quicker than you'd think and you can keep track of your progress by pausing the game and selecting "achievements" from the in game menu. Once you've won 20 games you'll unlock the final achievement.
That's it. You've completed the game pack. Congratulations!
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