Here is the full list of all 41 The Serpent Rogue achievements.
Catch 25 Fish in Water Banks
Discover the location of the Undertaker
Craft a Sanctum Vessel
Spend 500 Food to speed up time while sleeping
Discover a Dobhar Chu
Discover the Gorgon's Location
Remove Poison from yourself or your followers 10 times
Tame a Valravn
Gather 10 Followers in the Camp location
Using water, extinguish fire from yourself 3 times
Create 5 Creatures
Cook 20 different dishes
Bind 10 Creatures from the Mavka
"Receive 100 total damage from enemies "
Open 25 Locks using a Picklock
Brew 10 Sloppy Potions
Remove Corruption from 12 Creatures
Buy 5 Items From the Merchant House
Discover 15 Creatures in the Journal
Find the Fighting Pit
Open 3 Moonstone Chests
Block incoming damage with a Broom 50 times
Destroy 10 Soul Vessels
Enhance 10 Weapons in the Smeltery
Brew 15 Unique Potions
Find 25 Worms in Stumps
Brew 30 Unique Potions
Light up an extinguished Torch
Play with 5 different Creatures
Disperse 3 Ghouls using the Undertaker
Steal 8 Items from Creatures
Apply the "Stinky" status effect to yourself or an NPC 3 times
Lay 5 Eggs
Bind 15 people from the Harbormaster
Resurrect 5 followers with the Undertaker
Shoot down 5 flying Chickens
Research all Ingredients in your Journal
Catch 15 Butterflies
Collect 500 Gold Coins
Eat raw food 5 times
Complete a Fallen Warrior Quest