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