Here is the full list of all 31 One Dog Story achievements.
You only live once
Hydrophob is dead
Bonus weapon
High jump
The Keeper of the Underworld has been annihilated
Cthulhu has been slain
Gobbled up
The King of Slugs has fallen
Let’s play baseball
The Rat King has been destroyed
The Needler is neutralized
The Keeper has been slaughtered
Albert has been executed
Brotherly Love
I’m the boss here
You’re on your own
Restless mind
Rest In Peace
all collectables have been found
Yay!
Be right back
Not enough air
Got smashed to smithereens
Abyss-mal fall
Jet pack found
Hoverboard found
Piece of cake
Everything in moderation
Huh, am I still alive?
Robot X01 has been destroyed