Full list of all 20 Battleship achievements worth 200 gamerscore. It takes around 80-100 hours to unlock all of the achievements on Windows Phone.
Miss 20 times before you hit a ship.
Sink your opponent's Battleship before any other ship.(Classic Mode Only)
Score a hit on your first Salvo. (Salvo Mode Only)
Hit all 5 ships in a single turn while in Salvo Mode.
Unlock all super weapons.
Win a Super-weapons game without using any super weapons. (Only Shell)
Sink 5 Reinforcement ships.
Hit at least one target on your first 3 turns. (Salvo Mode Only)
Sink 15 Aircraft Carriers. (Classic Mode Only)
Hit your targets 250 times. (Classic Mode Only)
Play all game modes. (MP)
Finish a game with two ships still afloat that are next to each other. (MP)
Win very first Multiplayer game. (MP)
Win 5 Salvo games, not using Best of 5. (MP)
Finish a game with your Destroyer still afloat. (MP)
Sink 10 Recon Boats using Best of 5. (MP)
After the enemy sinks your sub, return the favor on your next turn.(MP)
Win a game having only one ship with only one hit remaining.(MP)
Win 50 matches. (MP)
Win 200 matches. (MP)