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