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