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