Here is the full list of all 29 Shooty Skies achievements.
Collect 5 Gold Pilots
Defeat 3 sparkly rare enemies
Clear level 1 in Classic Shooty on Scouty or Skirmish Intensity
Score 100 points in one game of Classic Shooty on Scouty or Skirmish Intensity
Score 100 points in one game of Classic Shooty on Shooty Intensity
Collect 5 Secret Unlock Pilots
Collect 10 Pilots
Complete 5 Daily Missions
Collect 500 coins
Fly with 3 different sidekicks in a Classic Shooty game
Defeat 7 different bosses in Classic Shooty on Screamy Intensity
Defeat 500 enemies
Collect 10 Golden Tickets
Defeat 5 different bosses in Classic Shooty
Score 250 points in one game of Classic Shooty on Screamy Intensity
Clear level 1 in Classic Shooty on Shooty or Screamy Intensity
Defeat 200 Arcade Machines
Get a ball bounce score of 10 in Classic Shooty
Collect 100 Rings in Daily Missions
Clear all Daily Missions in a Calendar Month once
Complete all daily mission objective types
Unlock Drama Llama
Collect 100 Kittens in Daily Missions
Spend 10 minutes escorting in Daily Missions
Play 7 consecutive days
Use 3 different boosts from the upgrade system
Score 1750 points in one game of Classic Shooty on Shooty or Screamy Intensity
Get a ball bounce score of 12 in Classic Shooty on Screamy Intensity
Spend 5 minutes escorting in Daily Missions on Screamy Intensity