Here is the full list of all 22 Aqua Boy achievements.
Finished the tutorial and arrived at Karken's Outpost.
Reached the Lost City of Pathandor.
Entered the crystal shaft.
Collected all health upgrades.
Collected all weapon upgrades.
Collected all charge upgrades.
Found the Shockwave Bomb.
Found the Shield Module.
Found the Hourglass.
Found the Orb of Destiny.
Found the Bananagun.
Found the coffee.
Found Karken's Pyjamas.
Found the Regenerating Health Module.
Found the Pistol Power Pack.
Defeated the Sea Bees.
Defeated Bangcrack.
Defeated PathNet.
Defeated the Anglerfish.
Defeated Albert.
Completed the game.
100% completion.