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