Here is the full list of all 25 Skycadia achievements.
The base game contains 16 achievements, and there is 1 DLC pack containing 9 achievements.
Bounty Hunt for 5 hours
Defeat 1,000 enemies
Bounty Hunt for an hour
Unlock the Chargeshot by earning a total of $100k bounty
Unlock Lord Yolka by earning a total of $80k bounty
Bounty Hunt for 20 minutes
Unlock the Scattershot by earning a total of $40k bounty
Unlock Big Bucket by earning a total of $20k bounty
Collect a total of $15,000 bounty
Defeat 100 enemies
Collect a total of $5,000 bounty
Complete your first Bounty Hunt
Collect at least $100 bounty in a single hunt
Collect at least $250 bounty in a single hunt
Collect at least $500 bounty in a single hunt
Defeat 10 enemies
Shoot down the bounty Queen Bee
Shoot down the bounty Aether
Shoot down the bounty Quito
Shoot down the bounty Mageetle
Shoot down the bounty Tyrantula
Shoot down the bounty Ladybug
Shoot down the bounty Hopper
Shoot down the bounty Anton
Beat Story Mode