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