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