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