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