Master and Commander Achievement
Master and Commander20
Win 25 games.
These achievements can be boosted with another player or yourself. Use the gamertag you want to get the achievements with to invite the other player to the game. The other player just needs to accept the invite and immediately concede the game. This is done in-game by selecting the arrow in the top right corner of the screen, then clicking on the image of the flag and confirming the forfeit. After the other player has conceded, you need to click on the game so that you see the "victory" screen for the game to count towards your total wins. You can check your progress towards 25 wins from the Main Menu under Achievements.