Here is the full list of all 14 Aviators achievements.
Complete the Baptism of Fire level.
Quickly deal with enemies in Baptism of Fire.
Complete the Hangar level.
Tune in to the secret broadcast frequency.
Start all 4 engines without single fail.
Complete the Warsaw level.
Destroy all enemies on the Vistula level.
Sacrifice yourself while playing Vistula level.
Destroy the secret enemy in Warsaw.
Complete the Homecoming level
Complete the Homecoming level without any enemy noticing.
Walk through the minefield without picking up the map.
Discover all journal entries.
Complete the Bochnia level.