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