Full list of all 15 Snoopy Flying Ace achievements worth 250 gamerscore. It takes around 8-10 hours to unlock all of the achievements in the base game.
The base game contains 12 achievements worth 200 Gamerscore, and there is 1 DLC pack containing 3 achievements worth 50 Gamerscore.
Reached Flying Ace Status (Xbox LIVE Player Match Only).
Earned 10,000+ points (Xbox LIVE Player Match Only).
Earned gold medals on all Navigation Missions (Ring Race, Birds of War, and Follow the Leader).
Earned gold medals on all Assault Missions (Bully Fight, Zeppeligeddon, and Bombs Away).
Earned gold medals on all Defense Missions (Headquarters, Big Guns, and Reconnaissance).
Earned Doghouse reward 10 times (Multiplayer Only).
Completed any mode with 20+ kills and no deaths (Multiplayer Only).
Earned 25+ kills with every secondary weapon.
Earned 25 wins (Multiplayer Only).
Earned 250 assists.
Earned 100 kills from the Turret
Completed a game of Dogfight
Earned 50+ kills for both "Kite" class airplanes (Dragonfly and Whirlybird)
Survived 5 minutes with no deaths (Xbox LIVE Player Match Only).
Killed any Blockhead (Xbox LIVE Player Match Only)