Here is the full list of all 35 Eagle Flight achievements.
Gather every collectible in the Basilica district
Gather every collectible in the game
Gather every collectible in the Louvre district
Gather every collectible in the Pantheon district
Gather every collectible in the Eiffel Tower district
Eliminate 50 bats
Earn 3 stars on every challenge
Earn 3 stars on every Tunnel challenge
Complete the Eiffel Tower chapter
Earn 3 stars on every Escort challenge
Defeat the Grim Falcon
Earn 3 stars on every Chase challenge
Earn 3 stars on every Enemy Attack challenge
Earn 3 stars on every Ring challenge
Earn 3 stars on every Find the Fish challenge
Eliminate 50 falcons
Gather every collectible in the Notre-Dame district
Complete the Pantheon chapter
Hit an enemy from over 500 meters away
Eliminate 80 crows
Complete the Basilica chapter
Complete the Louvre chapter
Earn 3 stars on every Feather Rush challenge
Eliminate 100 vultures
Finish an enemy attack with one less Screech Wave than targets
Eliminate 2 enemies with one Screech Wave
Complete the Notre-Dame chapter
Complete the flight tutorial
Collect all other achievements
Be the first eagle to catch the prey in multiplayer
Eliminate 1000 enemies in multiplayer
Deliver 100 prey to your nest in multiplayer.
Win 200 games in multiplayer
Deliver 3 prey back to your nest in one multiplayer match
Fly for 1,609 km total