Here is the full list of all 63 AquaNimble achievements.
Die once
Unlock a Vessel
Unlock all vessels
Die 100 times
Die 1,000 times
Die 500 times
Die 250 times
Go up a rank
Get to rank 20
Kill 500 enemies
Kill 2,000 enemies
Kill 10,000 enemies
Kill 100,000 enemies
Kill 1 million enemies
You beat a level
Beat the Pacific campaign
Beat the Atlantic campaign
Beat the Arctic campaign
Beat a daily campaign
Play a daily campaign
Beat a forever abyss campaign
Play a forever abyss campaign
Beat 3 campaigns
Use 10 giga charge shots in a single level
Get hit by 100 projectiles without taking damage
Kill 20 flesharks
Unlock cat mode
Beat a level in pacafist
Light 1,000 enemies on fire
Collect all fuel cans in a bonus stage
Collect 1 million stars
Collect 50,000 stars
Defeat Predusa
Defeat Ventronaship
Defeat the second giant boss
Defeat Crustaculous
Defeat Sonarus
Defeat Eyeceratops
Defeat Tridemodan
Get a chain of 100 or more
Get a chain of 900 or more
Get a chain of 500 or more
Get a chain of 750 or more
Get a chain of 1,000 or more
Get healed 100 points of health
Defeat 10 tragons
Destroy 50 dragons
Make it through any level's shark section without taking damage
Destroy 20 cup creame clown cars
Complete a campaign on nightmare difficulty
Use 50 specials
Complete a level without dying
Have 5+ bombs
Get an extra life from points
Complete any level using a different skin
Complete any campaign without using a continue in arcade mode (1CC)
Destroy 10 Spinning Shooter Skulls
Amass 1 million XP
Finish the instructions
Amass 2 million XP
Amass 5 million XP
Amass 100,000 XP