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