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