Here is the full list of all 27 Sky Force Anniversary achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Rescue 1 000 people.
Earn 50 medals.
Finish a stage with your health lower than 5%.
Enter the tournament.
Destroy 10 000 enemies.
Use 3 different power-ups in a single game.
Rescue 500 people.
Save 5 power-ups at the end of the stage.
Burn through 10 enemies with your Laser.
Use any 5 power-ups in a single game.
Earn 10 medals.
Destroy 2 500 enemies.
Rescue 100 people.
Destroy 1 000 enemies.
Destroy the lighthouse without touching it.
Earn 100 medals.
Collect 100 000 stars.
Collect 200 000 stars.
Save 20 000 stars in your bank.
Ram through an enemy wave with your Energy Shield.
Destroy at least 15 enemies with one Mega-Bomb.
Rescue your friends 20 times.
Rescue 5 VIPs.
Find all the cards.
Collect all the stars from Stage 3.
Complete Stage 8 without using power-ups.
Destroy all enemy towers on Stage 5.