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