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.
Complete a game of Dogfight
Earn gold medals on all Defense Missions (Headquarters, Big Guns, and Reconnaissance).
Earn gold medals on all Assault Missions (Bully Fight, Zeppeligeddon, and Bombs Away).
Earn gold medals on all Navigation Missions (Ring Race, Birds of War, and Follow the Leader).
Earn 100 kills from the Turret
Complete any mode with 20+ kills and no deaths (Multiplayer Only).
Earn 250 assists.
Earn 25 wins (Multiplayer Only).
Earn 25+ kills with every secondary weapon.
Earn Doghouse reward 10 times (Multiplayer Only).
Earn 10,000+ points (Xbox LIVE Player Match Only).
Reach Flying Ace Status (Xbox LIVE Player Match Only).
Kill any Blockhead (Xbox LIVE Player Match Only)
Survive 5 minutes with no deaths (Xbox LIVE Player Match Only).
Earn 50+ kills for both "Kite" class airplanes (Dragonfly and Whirlybird)