Here is the full list of all 14 Diesel The Pug Warrior achievements.
Beat the Squirrel in the Tutorial
Beat the Awesome Tangerine
Now we got to save the Kingdom from Luna!
Beat your first Shadow
Beat your first Mental
Give Bill and Ted their Guitars back
Save the Kingdom!
Yoooooo Lets GOOOOOOO
Fred says Beep Beep
You got a cool Hat
Play and Beat the Mini Trials
You beat all stages of Connie
The Ultima Sword
Have one of everything and beat the game