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