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