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