Here is the full list of all 25 Creature in the Well achievements.
Find all capes
Find Phillip's prototype
Heal a total of 1,000 health absorbed from anomaly balls
Help Roger mop the floor
Save Mirage from the sandstorm
Find all of Danielle's tools
Enter the Creature's well
Find the scavenger's hidden stash
Find all the lore
Fully upgrade the BOT-Core
Unlock the Weather Control Monolith
Generate a total of 2,000,000 power
Destroy 100 drones using EMPs
Charge 7 orbs at once
Let's play
Hit 20 bumpers with one shot
Unlock the Support Monoliths
Upgrade your BOT-Core
Try to escape the sandstorm
Find a secret strike tool
Activate the Power Reserves
Find a secret charge tool
Generate 1,000 power in one hit
Get thrown out of the machine
Open the temple