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