Back to boot camp
Miss 20 times before you hit a ship.
10 ✓ January 2nd, 2013
Admiral
Win 200 matches. (MP)
20
Gun Captain
Unlock all super weapons.
15
I See You
Hit your targets 250 times. (Classic Mode Only)
15 
Buddy System
Finish a game with two ships still afloat that are next to each other. (MP)
15 
I sunk your battleship
Sink your opponent's Battleship before any other ship.(Classic Mode Only)
10 
Eyes on the target
Score a hit on your first Salvo. (Salvo Mode Only)
10
On the hunt
Hit all 5 ships in a single turn while in Salvo Mode.
10
Reinforcements did not come
Sink 5 Reinforcement ships.
10
No blue horizon
Sink 15 Aircraft Carriers. (Classic Mode Only)
10
Undisputed
Win 5 Salvo games, not using Best of 5. (MP)
10
Sunk but not Destroyed
Finish a game with your Destroyer still afloat. (MP)
10
Not so sneaky
Sink 10 Recon Boats using Best of 5. (MP)
10 
What comes around
After the enemy sinks your sub, return the favor on your next turn.(MP)
10
Commodore
Win 50 matches. (MP)
10 
This is all I need to beat you
Win a Super-weapons game without using any super weapons. (Only Shell)
5 
Locking on
Hit at least one target on your first 3 turns. (Salvo Mode Only)
5
Jack of all trades
Play all game modes. (MP)
5 
Winning!
Win very first Multiplayer game. (MP)
5
Down with the Ship
Win a game having only one ship with only one hit remaining.(MP)
5