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