Here is the full list of all 45 Aces of the Luftwaffe achievements.
Kill 300 Focke-Wulfs. (Mission 1-1)
Kill 1000 foes!
Shoot down 5000 planes.
Rack up 25000 kills!
Bomb 100 targets.
Bomb 500 targets.
Bomb 2500 targets.
Collect 1000 Medals.
Grab 5000 Medals.
Need! Need! Need!
7777 confirmed Focke-Wulf kills.
1337 confirmed Me262 kills.
88 confirmed Ju88 kills.
666 confirmed Ghost kills.
Collect 48 Power-Ups.
Kill a dozen Messerschmitts! (Mission 1-1)
Dance, dive bombers. Dance! (Mission 1-2)
Kill three Heinkel Bombers. (Mission 1-2)
Down half a dozen heavy bombers. (Mission 1-3)
Shoot down 50 jet planes. (Mission 1-3)
Defeat General Neumann.
Complete all Missions of Chapter 1.
Bomb 6 Axis factories with the Allied bomber. (Mission 2-1)
Bomb all the Axis panzers invading France. (Mission 2-2)
Bomb 30 AA gun nests! (Mission 2-3)
Shoot down all three of the Super Planes. (Mission 2-3)
Defeat Major Kohler.
Complete all Missions of Chapter 2.
Shoot down 25 Bf110 planes. (Mission 3-1)
Kill a Fiat BR.20 bomber. (Mission 3-1)
Bomb 40 AA gun nests! (Mission 3-2)
Whatever those things are, kill them. (Mission 3-2)
Rumor has it there's over 70 airborne. (Mission 3-3)
Defeat Oberst Müller.
Complete all Missions of Chapter 3.
Stay stealthy the entire mission. (Mission 4-1)
Shoot down 10 Zeppelins. (Mission 4-2)
Defeat the Mad Scientist. (Mission 4-4)
Complete all Missions of Chapter 4.
Shoot down 15 Heinkel planes. (Mission 5-1)
Bomb 3 Axis Airbases with the Allied bomber. (Mission 5-2)
Shoot down all 7 Ghost planes. (Mission 5-2)
Evade all Mines. (Mission 5-3)
Defeat Commander Meiler
Complete all Missions of Chapter 5.