Here is the full list of all 45 Aces of the Luftwaffe achievements.
7777 confirmed Focke-Wulf kills.
Bomb 100 targets.
Bomb 6 Axis factories with the Allied bomber. (Mission 2-1)
Shoot down 5000 planes.
Defeat General Neumann.
Complete all Missions of Chapter 1.
Collect 1000 Medals.
Shoot down 50 jet planes. (Mission 1-3)
Down half a dozen heavy bombers. (Mission 1-3)
Dance, dive bombers. Dance! (Mission 1-2)
Kill three Heinkel Bombers. (Mission 1-2)
Kill a dozen Messerschmitts! (Mission 1-1)
Collect 48 Power-Ups.
Kill 1000 foes!
Kill 300 Focke-Wulfs. (Mission 1-1)
Rack up 25000 kills!
Bomb 500 targets.
Bomb 2500 targets.
Grab 5000 Medals.
Need! Need! Need!
1337 confirmed Me262 kills.
88 confirmed Ju88 kills.
666 confirmed Ghost kills.
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.