Here is the full list of all 23 Loddlenaut achievements.
Leave GUP-14.
Reach the maximum loddle capacity in all biomes.
Find all Holo-Badges.
Encounter all loddle evolutions.
Clean all biomes on GUP-14.
Release a loddle into the open ocean.
Find the abandoned CEO office.
Destroy 80 crates.
Enter Metzi Trench.
Have the maximum number of loddles following you.
Unlock the Puddle Scrubber.
Reach the maximum loddle capacity in a biome.
Run out of oxygen for the first time.
Cook a loddle snack.
Discover a loddle’s favorite food.
Collect 500 pieces of litter.
Pet a loddle.
Find a Holo-Badge.
Evolve a baby loddle into an adult.
Clean a biome to 100%.
Clean up a goopy loddle.
Meet a loddle for the first time.
Complete the Home Cove tutorial.