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