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