Here is the full list of all 50 Sid Meier's Ace Patrol: Pacific Skies achievements.
Win the Campaign as the Japanese Army
Earn 50,000 points with a Japanese Army squadron
Win a Battle as the Japanese Army
Earn 5 Victories with a Japanese Army Pilot
Win the Campaign as the US Army
Earn 50,000 points with a US Army squadron
Win a Battle as the US Army
Earn 5 Victories with a US Army Pilot
Win the Campaign as the Japanese Navy
Earn 50,000 points with a Japanese Navy squadron
Earn 5 Victories with a Japanese Navy Pilot
Win a Battle as the Japanese Navy
Win the Campaign as the US Navy
Earn 50,000 points with a US Navy squadron
Create a Squadron with four aces
Shoot down 3 planes with 1 pilot in 1 mission: Rookie
Win a Battle as the US Navy
Earn 5 Victories with a US Navy Pilot
Win a Mission at Pilot difficulty level
Win a Mission at Ace difficulty level
Win a Mission at Leader difficulty level
Win a Mission at Legend difficulty level
Earn 100,000 points with a US Army squadron
Earn 100,000 points with a US Navy squadron
Earn 100,000 points with a Japanese Army squadron
Earn 100,000 points with a Japanese Navy squadron
Earn 150,000 points with a US Army squadron
Earn 150,000 points with a US Navy squadron
Earn 150,000 points with a Japanese Army squadron
Earn 150,000 points with a Japanese Navy squadron
Achieve a 5,000 point mission with the US Army
Achieve a 5,000 point mission with the Japanese Navy
Achieve a 10,000 point mission with the US Army
Achieve a 10,000 point mission with the US Navy
Achieve a 10,000 point mission with the Japanese Army
Achieve a 10,000 point mission with the Japanese Navy
Achieve a 15,000 point mission with the US Army
Achieve a 15,000 point mission with the US Navy
Achieve a 15,000 point mission with the Japanese Army
Achieve a 15,000 point mission with the Japanese Navy
Earn 50 Victories with a US Army Pilot
Earn 50 Victories with a US Navy Pilot
Earn 50 Victories with a Japanese Army Pilot
Earn 50 Victories with a Japanese Navy Pilot
Shoot down 3 planes with 1 pilot in 1 mission: Pilot
Shoot down 3 planes with 1 pilot in 1 mission: Ace
Shoot down 3 planes with 1 pilot in 1 mission: Leader
Shoot down 3 planes with 1 pilot in 1 mission: Legend
Achieve a 5,000 point mission with the US Navy