Here is the full list of all 39 Paw Paw Paw achievements.
Break into the castle
Reach level 10 on a character
Ride the Skywhale
Defeat Warden
Roll 1,000 times
Survive The Pit
Defeat The Dark Knights
Drink 100 potions
Play co-op with 4 Players
Get into the city
Die 100 times
Hit 10 innocent bystanders
Defeat Worm
Defeat Aegel
Skate off the avalanche
Defeat Baby God
Unlock Welu
Reach level 5 on a character
Defeat Grillz
Defeat Gragal
Unlock Obek
Defeat Big Bad Pug
Defeat Root
Push the payload
Unlock Doggu
Play co-op
Defeat King Bunnylord III
Unlock Domba
Complete the story mode
Unlock 50 weapons
Unlock 20 legendary weapons
Recruit 50 companions
Spend 500,000 foods
Have 100,000 foods
Throw 100 bombs
Ride 100 mounts
Reach max level on a character
Break 500 chests or barrels
Defeat 1,000 enemies