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